Question

im expanding (7x-2y)^3 using pascal's triangle...i need to have it checked for accuracy ASAP :)

(7x-2y)(7x-2y)(7x-2y)
1+3+3+1
(7x)^3+3(7x)^2+3(7x)+1
343x^3-294x^2y+84xy^2-8y^3

Answer 1

@experimentX wanna giv it a try? :)

Answer 2

looks right to me

Answer 3

so how exactly would i check it if i wanted to by myself?

Answer 4

oh but your last y though

Answer 5

its y^3 i know :P

Answer 6

right?

Answer 7

343x^3-294x^2y+84xy^2-8y^3

yeah

Answer 8

aright cool thanks @TuringTest :)

Answer 9

really I would have written it like this:

1 3 3 1
(7x)^3+3(7x)^2(-2y)+3(7x)(-2y)^2+1(-2y)^3
then you can see that your answer is correct

Answer 10

hmm okay :)

Answer 11

nice i probably shud hav...thanks again! :D

Answer 12

welcome :)

Answer 13

:)