SOLUTION: Solve the equation for x. Square root of 56-x = x The correct answer is one of the following. Which one is correct? A) x=7 only B) x=7, x=-8 C) x=-8 only D) x=7, x

Algebra ->  Equations -> SOLUTION: Solve the equation for x. Square root of 56-x = x The correct answer is one of the following. Which one is correct? A) x=7 only B) x=7, x=-8 C) x=-8 only D) x=7, x      Log On


   

Question 1198778: Solve the equation for x. Square root of 56-x = x
The correct answer is one of the following. Which one is correct?
A) x=7 only
B) x=7, x=-8
C) x=-8 only
D) x=7, x=8
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the equation for x. Square root of 56-x = x
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If you mean sqrt%2856-x%29+=+x
Square both sides
56-x = x^2
x^2 + x - 56 = 0
(x-7)*(x+8) = 0
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check each result