Question

Help.

Answer 1

8a^3 + c^3

Answer 2

@ParthKohli

Answer 3

i know the answer.

Answer 4

i want to know how to do it. well i do know, but its another way.

Answer 5

\[a^3 + b^3 = (a+b)(a^2 - ab + b^2)\]So... is that a good hint?

Answer 6

i already have that.

Answer 7

Now you can write your expression as \((2a)^3 + c^3\)

Answer 8

ok got that too.

Answer 9

after that is where i got confused.

Answer 10

\[a^3 + b^3 = (a + b)(a^2 -ab + b^2)\]\[(2a)^3 + c^3 = (2a + c)((2a)^2 - (2a)(c) + c^2)\]

Answer 11

yeah i just did that.

Answer 12

i assume we have to simplify more? right?

Answer 13

Yes.

Answer 14

You can write \((2a)^2 = 4a^2\)

Answer 15

i got it :)

Answer 16

i see my mistake

Answer 17

i wrote it as (2a + c)(2a^2 - 2ac + c^2)

Answer 18

but it was supposed to be (2a + c)((2a)^2 - 2ac + c^2)

Answer 19

thanks ^.^

Answer 20

Indeed!

Answer 21

thank you @ParthKohli :D

Answer 22

Nay problem. 8-)