Literally everything, but uh, polynomials? And such?
I am in desperate need of someone who passed ninth grade math, or is at least decent at it. Kinda urgent.
Mkay, I'll try to help
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(I hate math but I'm pretty decent at it? I did applied math last semester and got one of the highest scores in the school so I might be able to help? (Give me a problem and I can probably show you how to solve it…)
person_off
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(And I think I remember how to solve polynomials…)
Well, here's this for the current quiz
(5x+3)(5x-3)
Alright. So you do FOIL, which means First, Outside, Inside, Last when you multiply.
Here's step by step:
(5x+3)(5x-3)
F: (first terms of both parts) 5x and 5x. Multiply them, you get 25x^2.
O: (outside terms of the entire expression) 5x and -3. Multiply them, you get -15x.
I: (inside terms of the entire expression) 3 and 5x. Multiply them, you get 15x.
L: (last terms of both parts) 3 and -3. Multiply them, you get -9.
Put everything together (you literally just add): 25x^2 + (-15x) + 15x + (-9).
The -15x and 15x cancel each other out since combined they equal 0, so you're left with 25x^2 - 9.
Another trick is that since 5x+3 and 5x-3 are basically the same thing except for the addition and subtraction sign, you can just multiply the first and last terms of both parts.
First terms: 5x and 5x, multiply you get 25x^2.
Last terms: 3 and -3, multiply you get -9.
Put it all together: 25x^2 - 9.
This only works if they both are the same thing with one addition and one subtraction sign.
person_off
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(Sorry I took too long…. stuff is pretty rock rn…)
Hey, that actually makes a bit of sense. Thanks man!
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(Sorry if I wasn't any help…)
=5x+3*5x-3
=5x+15x-3
=20x-3
(The asterix ( * ) is multiplication)
…that's not right… since the question was (5x+3)*(5x+3). The parentheses matter.
I hate foil so much, I always want to just distribute normally and then Foil comes out of no where and is like BWUHW It's me and stabs you with tedious math work.
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=5x+3*5x-3
=5x+15x-3
=20x-3
(The asterix ( * ) is multiplication)…that's not right.
I tried….. Facepalms that's how I was taught to do it… though I could be missing a step…
XD Foil is pretty annoying but it's a good way to remember.
person_off
Deleted user
=5x+3*5x-3
=5x+15x-3
=20x-3
(The asterix ( * ) is multiplication)…that's not right… since the question was (5x+3)*(5x+3). The parentheses matter.
RIIIIGHT….. (This is why I hate math…. I think I have it, then I do it all wrong…)
Wait is the problem a polynomial or just a math problem because if it's a polynomial the math is completely different, if it's a polynomial the answers are -.6 and .6
=5x+3*5x-3
=5x+15x-3
=20x-3
(The asterix ( * ) is multiplication)…that's not right.
I tried….. Facepalms that's how I was taught to do it… though I could be missing a step…
No no, you're fine. The question just had parentheses around the terms so you had to do foil.
person_off
Deleted user
(I believe a polynomial is a group of terms, and contains only multiplication. No addition or subtraction)
person_off
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=5x+3*5x-3
=5x+15x-3
=20x-3
(The asterix ( * ) is multiplication)…that's not right.
I tried….. Facepalms that's how I was taught to do it… though I could be missing a step…
No no, you're fine. The question just had parentheses around the terms so you had to do foil.
I was never taught foil….
Wait is the problem a polynomial or just a math problem because if it's a polynomial the math is completely different, if it's a polynomial the answers are -.6 and .6
^^^ yeah if that entire expression equals 0 you have to ignore everything I said.
=5x+3*5x-3
=5x+15x-3
=20x-3
(The asterix ( * ) is multiplication)…that's not right.
I tried….. Facepalms that's how I was taught to do it… though I could be missing a step…
No no, you're fine. The question just had parentheses around the terms so you had to do foil.
I was never taught foil….
Hmm that's weird.
I'm incredibly confused again, but does anyone know anything about writing a polynomial in descending order?
person_off
Deleted user
No no, you're fine. The question just had parentheses around the terms so you had to do foil.
I was never taught foil….
Hmm that's weird.
yeah….. and I got top marks in my class too…. actually most of the class was review for me cause my mom had me doing advanced work (When compared to the public school curriculum) in grade eight, (Homeschooled)
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I'm incredibly confused again, but does anyone know anything about writing a polynomial in descending order?
biggest to smallest?
(I believe a polynomial is a group of terms, and contains only multiplication. No addition or subtraction)
(Polynomials can be anything, they can have variables exponents and constants, be added subtracted, multiplied or divided, except the variables you can't divide by the variable. Polynomials are basically just a graph so if you can graph it you can make a polynomial out of it)
I'm incredibly confused again, but does anyone know anything about writing a polynomial in descending order?
Descending order is literally looking only at the exponent. Whatever power the exponent is raised to, you do it biggest to smallest.
So if you have 5x^4 + x - 3x^3, in the first term x is raised to 4. The second term x is raised to 1. Third term x is raised to 3.
Then you do it in order biggest to smallest; so 4, 3, 1. That gives you 5x^4 - 3x^3 + x.
person_off
Deleted user
(I believe a polynomial is a group of terms, and contains only multiplication. No addition or subtraction)
(Polynomials can be anything, they can have variables exponents and constants, be added subtracted, multiplied or divided, except the variables you can't divide by the variable. Polynomials are basically just a graph so if you can graph it you can make a polynomial out of it)
Yeah but a polynomial can't contain addition or subtraction.
This: (2y^53xa) is a polynomial
but this: (2y-3xa^7) is not.
(That is as far as I remember, correct… I think…)
I'm incredibly confused again, but does anyone know anything about writing a polynomial in descending order?
Basically you just rewrite the problem so the variable numbers go biggest to smallest with out changing the answer. So if your problem was 6-5x+30x^2 you could re write that as 30x^2 - 5x+6
… I think
(I believe a polynomial is a group of terms, and contains only multiplication. No addition or subtraction)
(Polynomials can be anything, they can have variables exponents and constants, be added subtracted, multiplied or divided, except the variables you can't divide by the variable. Polynomials are basically just a graph so if you can graph it you can make a polynomial out of it)
Yeah but a polynomial can't contain addition or subtraction.
This: (2y^53xa) is a polynomial
but this: (2y-3xa^7) is not.
(That is as far as I remember, correct… I think…)
(Nope, put it into a graphing machine and it graphs…sorta, it's hard to describe but it's still a polynomial )
person_off
Deleted user
Yeah but a polynomial can't contain addition or subtraction.
This: (2y^53xa) is a polynomial
but this: (2y-3xa^7) is not.
(That is as far as I remember, correct… I think…)(Nope, put it into a graphing machine and it graphs)
My math teacher has explaining to do.
Yeah but a polynomial can't contain addition or subtraction.
This: (2y^53xa) is a polynomial
but this: (2y-3xa^7) is not.
(That is as far as I remember, correct… I think…)(Nope, put it into a graphing machine and it graphs)
My math teacher has explaining to do.
I learned 95% of my math online… I can direct you to some helpful websites though Mathisfun is one of my favorites it explains things very well, for polynomials here's the link https://www.mathsisfun.com/algebra/polynomials.html