SOLUTION: If x^2 + 5x = 5 find the value of x^3 + 6x^2.

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Question 1126781: If x^2 + 5x = 5 find the value of x^3 + 6x^2.
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
+highlight%28+5+%29+
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Workout:
+x%5E2+%2B+5x+=+5+

Add x both sides:
+x%5E2+%2B+5x+%2B+x+=+5+%2B+x+
+x%5E2+%2B+6x+=+5+%2B+x+

Multiply both sides by x:
+x%5E3+%2B+6x%5E2+=+5x+%2B+x%5E2+

RHS is original expression, which is 5.