Question

factor sum of cubes
Help please?

Answer 1

I don't think I factored the sum of cubes correctly, because when I checked it, it didn't equal the original expression. What did I do wrong?

Answer 2

@iambatman

Answer 3

@Nnesha @TheSmartOne

Answer 4

Notice that if the side of the second cube is \(2t\) then the volume would be \((side)^3 = (2t)^3 = 8t^3\).
That affects your first answer.
In the second, make sure to do \((2t)^2 = 4t^2\) and not \(2t^2\) as you have now.

Answer 5

OK. Is it correct now?

Answer 6

@pitamar

Answer 7

Well you got \(4t\) out of \((2t)^2\) so not yet.

Answer 8

Oh, yeah, that was a typo

Answer 9

besides that it all seems good to me =)
but you still have to correct the last answer.

Answer 10

What is wrong there?

Answer 11

You changed the first answer, so your calculation should be done with the new formula.

Answer 12

Should it be like this:

(2 * 7)^3 + 12^3 = 14^3 + 12^3 = 2,744 + 12^3 = 2,744 + 1,728 = 4,472 cu. in.

Answer 13

@pitamar

Answer 14

@Nnesha

Answer 15

Ye, seems fine

Answer 16

@Nnesha , I want to know if this is finally all correct:

Answer 17

Ye, seems correct to me =)

Answer 18

^

Answer 19

right :)

Answer 20

Thanks:)

Answer 21

np thanks to pitamar
he helped chu