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x*y=72
x=18-y
(18-y)*y=72
18y-y²=72
-y²+18y-72=0
Δ=18²-4*(-1)*(-72)=324-288=36
√Δ=6
y1=(-18-6):2*(-1)=-24:(-2)=12
y2=(-18+6):(-2)=-12:(-2)=6
6+12=18
6*12=72
Rozwiązaniem są liczby 6 oraz 12.