forum I am in desperate need of someone who passed ninth grade math, or is at least decent at it. Kinda urgent.
Started by @croccin-champagne
tune

people_alt 39 followers

@Relsey-TheElder

(I'm like 56% sure the answer to the second problem is -1… not sure if that's any help because your test is already over but…. yep)

Deleted user

(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…)

Deleted user

(And I think I remember how to solve polynomials…)

@Trix

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.

Deleted user

(Sorry I took too long…. stuff is pretty rock rn…)

@Trix

=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.

@Relsey-TheElder

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.

Deleted user

=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…

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…)

@Relsey-TheElder

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

@Trix

=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.

Deleted user

(I believe a polynomial is a group of terms, and contains only multiplication. No addition or subtraction)

Deleted user

=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….

@Trix

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.

@Trix

=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.