Question

Help with Algebra 2 please?

1.(x+y)^3

I got
x^3 + 6x^2 +12x+8

Am I correct??

2. (x+y)^4

3. (x+1)^4

4. (x - 3y)^3

Help please ill try to give as MUCH points as I can I promise

Answer 1

Have you tried.

https://www.wolframalpha.com/

Answer 2

\(\bf (x+y)^3\implies (x+y)(x+y)(x+y) \ne x^3 + 6x^2 +12x+8 \)

Answer 3

do it in 2 steps
(x + 3)(x + 3)
distribute x and then +3 over the second bracket

= x^2 + 3x + 3x + 9
= x^2 + 6x + 9

now work out
(x + 3)(x^2 + 6x + 9) by a similar method

Answer 4

Thanks! :) What about the rest though?

Answer 5

they can all be done in much the same way

or you can use the Binomial theorem
- have you done that yet?