Question

Solve (8x + 3)^2 = 16

Answer 1

first lets break this up so we can use the FOIL method. Do you know how to do that?

Answer 2

Kinda, but not very well

Answer 3

well lets break up the left side first. show me what another way to represent that squared.

Answer 4

8x^3?

Answer 5

Not quite. we can rewrite this as (8x+3)(8x+3) = 16

Answer 6

OR!!

Answer 7

If we take the square root of both sides then we get (8x+3)= 4
That equation is much more simple to solve.

Answer 8

remember the square root undoes a square and vise versa.

Answer 9

Does that all make sense? If so, great! If not, let me know where you're stuck. If you do understand, post your answer and i will check your work!

Answer 10

-7/8, 1/8?

Answer 11

@agentc0re

Answer 12

Yup, that's correct! http://www.wolframalpha.com/input/?i=%288x%2B3%29%5E2%3D+16

Answer 13

Good job!