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maka pitagoras
x^2 + (x+5)^2 = 15^2
2x^2 +10x -200 = 0
x^2 +5x-100 = 0
tinggal di jabarkan aja.
NB: Soalnya ndak komplit
x^2 + 15^2 = (x+5)^2
x^2 + 225 = x^2 +10x + 25
225 - 25 = x^2 - x^2 + 10x
10x = 200
x = 20