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40z-(16z²+2*4z*5+5²)=-61 <-- tutaj stosujemy wzór skróconego mnożenia (a²+2*a*b+b²)
40z-(16z²+40z+25)=-61
40z-16z²-40z-25=-61
-16z²-25+61=0
-16z²+36=0
-16x²=36 //:(-16)
x²=-36/16
x=-6/4 v -6/-4
x=-1,5 v x=1,5
Odp:
x₁=-1,5
x₂=1,5