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x²+(x+7)²=13²
x²+x²+14x+49=169
2x²+14x=169-49
2x²+14x=120
2x²+14x-120=0 /;2
x²+7x-60=0
Δ=7²-4·1·(-60)=49+240=289√Δ=√289=17
x1=(-7-17) / (2·1)=-12 --->wynik ujemny odrzucamy
x2=(-7+17)/(2·1)=10/2=5
czyli :jedna przyprostokatna =5
druga przyprostokatna 5+7=12