Question

factor.
x^3- 343

Answer 1

343 = some number raise to the 3rd power, can you find that number out?

Answer 2

7 ^3?

Answer 3

ok , using the formula ...\[a^{3} - b^{3} = (a-b)(a^{2} + ab + b^{2})\]

now can you factor ?

Answer 4

would it be, (x^2-7x^2)(x+7)

Answer 5

no, can you read the formula and try again?

Answer 6

okay

Answer 7

(x-7)(x^2 + 7^2+7) is that right?

Answer 8

not quite, but you're close ...in your problem...a will be x and b is 7 ...so can you try one more time?
put in the form of the formula so it's easier for you to recognize.

Answer 9

(x-7)(x^2+ 7x^2 +7x) is that right?

Answer 10

it should be : \[(a-b)(a^{2} - ab + b^{2})\]

so \[(x-7)(x^{2} - 7x + 7^{2})\]

Answer 11

my bad...i rewrote the formula wrong...it's +ab ...so the -7x is +7x

Answer 12

thanks hero, and i wrote that formula on the top, just made a mistake rewrote that formula

Answer 13

i'm lost

Answer 14

been working on one question for an hour

Answer 15

(x-7)(x^2 +7b +7b^2) is that right?

Answer 16

okay thank you for your help

Answer 17

wouldn't 7 ^2 come before 7x?