SOLUTION: Please, help me with this problem: Solve - sqrt2x+1 = -9 a. 50 b. 4 c. 40 d. -41 Thank you!

Algebra ->  Square-cubic-other-roots -> SOLUTION: Please, help me with this problem: Solve - sqrt2x+1 = -9 a. 50 b. 4 c. 40 d. -41 Thank you!      Log On


   

Question 1070187: Please, help me with this problem:
Solve - sqrt2x+1 = -9
a. 50
b. 4
c. 40
d. -41
Thank you!
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Solve -+sqrt%28%282x%2B1%29%29+=+-9
multiply both sides by -1
sqrt%28%282x%2B1%29%29+=+9
square both sides
2x + 1 = 81
2x = 81 - 1
2x = 80
x = 80/2
x = 40