SOLUTION: Solve sqrt 2x + 15 = x + 6

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Question 1008300: Solve
sqrt 2x + 15 = x + 6
Found 2 solutions by MathLover1, mgmoeab:
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

sqrt%28+2x+%2B+15%29+=+x+%2B+6...square both sides
%28sqrt%28+2x+%2B+15%29%29%5E2+=+%28x+%2B+6%29%5E2
+2x+%2B+15+=+x%5E2+%2B+12x%2B36
+0+=+x%5E2+%2B+12x%2B36-2x-15
+x%5E2+%2B+10x%2B21=0
+x%5E2+%2B+3x%2B7x%2B21=0
+%28x%5E2+%2B+3x%29%2B%287x%2B21%29=0
+x%28x+%2B+3%29%2B7%28x%2B3%29=0
+%28x%2B3%29%28x%2B7%29+=+0
solutions:
if +%28x%2B3%29+=+0=>x=-3
if +%28x%2B7%29+=+0=>x=-7

+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+25%2C+x%5E2+%2B+10x%2B21%29+

Answer by mgmoeab(37) About Me  (Show Source):