Math help (again) -.-

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thread starter IKEA12311 Sep 11 2009 + PM | QUOTE | PERMALINK | REPORT

Factor this and show your steps (x^2 + 3x)^2 - 2(x^2 +3x) - 8

inuyasha520 09/11/09 + PM | QUOTE | PERMALINK | REPORT

are we doing your homework? *suspicious look*

IKEA12311 09/11/09 + PM | QUOTE | PERMALINK | REPORT

inuyasha520 : are we doing your homework? *suspicious look* i just need help >.>

iThunderC + PM | QUOTE | PERMALINK | REPORT

(x^4 + 9x^2) - (-2x^2 -6x) - 8 = x^4 + 9x^2 +2x^2 + 6x - 8 All I got so far lol

Ningen + PM | QUOTE | PERMALINK | REPORT

x^4 + 11x^2 + 6x - 8 ... Oh wait no. Isn't this simplifying? Oh well(:

iThunderC 09/11/09 + PM | QUOTE | PERMALINK | REPORT

Ninjen, you can't add the X's together can you?

IKEA12311 09/11/09 + PM | QUOTE | PERMALINK | REPORT

Ningen : x^4 + 11x^2 + 6x - 8 ... Oh wait no. Isn't this simplifying? Oh well(: It;s factoring

KingFire12 09/11/09 + PM | QUOTE | PERMALINK | REPORT

You have to use foil. Do the rest on your own.

BabysAreFood + PM | QUOTE | PERMALINK | REPORT

Ok you know Ax^2+Bx+C Well, this is in the same form except (x^2 +3x) is the X is the equation. So first we'll say y=x^2+3x. So Ay^2+By+C. Plug in the values for A, B, and C.. Y^2-2Y-8. Factor that into (Y+2)(Y-4). Now substitute x^2+3x back in [(x^2+3x)+2]*[(x^2+3x)-4] (x^2-3x+2)(x^2+3x-4) (x-2)(x-1)(x+4)(x-1) (x-1)^2(x-2)(x+4)

iThunderC 09/11/09 + PM | QUOTE | PERMALINK | REPORT

oh yeah that's what factoring is my bad

Ningen 09/11/09 + PM | QUOTE | PERMALINK | REPORT

iThunderC : Ninjen, you can't add the X's together can you? You can if the exponents are the same, otherwise you leave them. But this is the wrong answer anyways. xD

IKEA12311 09/11/09 + PM | QUOTE | PERMALINK | REPORT

BabysAreFood : Ok you know Ax^2+Bx+C Well, this is in the same form except (x^2 +3x) is the X is the equation. So first we'll say y=x^2+3x. So Ay^2+By+C. Plug in the values for A, B, and C.. Y^2-2Y-8. Factor that into (Y+2)(Y-4). Now substitute x^2+3x back in [(x^2+3x)+2]*[(x^2+3x)-4] Im sorry but that didnt make much sense. Could you explain again? D:

tailedfox13 09/11/09 + PM | QUOTE | PERMALINK | REPORT

da answer is: x^4 + 6x^3 +7x^2 -6x-8 not that hard, mate

Coax 09/11/09 + PM | QUOTE | PERMALINK | REPORT

(x^2 + 3x)^2 - 2(x^2 +3x) - 8 go in this order: simplify, combine like terms, factor (x^2 + 3x)(x^2 +3x)-(2x^2 + 6x) - 8 unfactored, and distributed now, from here i'm too lazy to do... do the steps i told you

BabysAreFood 09/11/09 + PM | QUOTE | PERMALINK | REPORT

IKEA12311 : Im sorry but that didnt make much sense. Could you explain again? D: Have you learned the Quadratic Formula and how to substitute?