169=x^2 + (x+7) ^2 what is x ?

Its for the pythagoreas therom problem solving question. x=5 but how did they get that?
in Algebra 1 Answers by Level 1 User (180 points)

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1 Answer

x^2 +x^2 +14x+49=169

2x^2 +14x -120=0

or x^2 +7x -60=0

zeroes...x=5 or -12
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