SOLUTION: Use the square root property to solve the equation (x + 8)^2 = 81 What is the solution set? Can someone explain to me how to do this? Thanks

Algebra ->  Square-cubic-other-roots -> SOLUTION: Use the square root property to solve the equation (x + 8)^2 = 81 What is the solution set? Can someone explain to me how to do this? Thanks       Log On


   

Question 439339: Use the square root property to solve the equation
(x + 8)^2 = 81
What is the solution set?
Can someone explain to me how to do this? Thanks
Found 3 solutions by stanbon, jorel1380, robertb:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Use the square root property to solve the equation
(x + 8)^2 = 81
---
(x+8)^2-9^2 = 0
Factor:
[x+8-9][x+8+9] = 0
[x-1][x+17] = 0
x = 1 or -17
==================
Cheers,
Stan H.

Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
(x+8)2=81
(x+8)(x+8)=81
x2+16x+64=81
x2+16x-17=0
(x+17)(x-1)=0
x=-17 or 1.

Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
%28x%2B8%29%5E2+=+81
==>x+8 = -9 OR x+8 = 9
==> x = -17 or x = 1
S.S. = {-17, 1}