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x+2 - długość drugiego boku
x^2 + (x+2)^2 = 16^2
x^2 + x^2+4x+4 = 256
x^2 + x^2+4x+4-256=0
2x^2+4x-252=0
Δ=4^2-4*1*(-252)
Δ=16+1008
Δ=1024
√Δ=32
x1=(-4-32)/4 x2=(-4+32)/4
x1=-9 sprzeczne x2=7
x=7
x+2=9
P=7cm * 9cm = 63cm^2