Question

Can someone check what I did wrong when solving (a+sqrtb)^3+(a+-sqrtb)^3?

Answer 1

The circled equations are the two things I am adding together

Answer 2

the very first step

whats the square of \(\sqrt b\)
?

Answer 3

Ohhhh, its b.

Answer 4

yes

Answer 5

in the second line from the top, how'd you get
\[a ^{2}+a \sqrt{b}+b^2\]?

Answer 6

Writing error. Thanks!

Answer 7

isn't there a 2 in front of the \[a \sqrt{b}\]?

Answer 8

let us know if you don't get
\( 2a (a^2 + 3b) \)
in the end, after the correction :)

Answer 9

there should be a 2 also,
as correctly pointed out by @jaeuni

Answer 10

So (a+b)^3 is different from a^3+b^3 right?

Answer 11

yes (a+b)^3 means that
(a+b)(a+b)(a+b)

Answer 12

Alright, thank you so much for your help!

Answer 13

np make sure to add the 2's for both the ( ) since that'll also change up your work as well