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x²+9=0 ∨ x²-16=0 ∨ √2+2x=0
x²+9=0= sprzeczne
x²-16=0 (x+4)(x-4)=0 x=-4∨x=4
√2+2x=0
2x=-√2
x=-√2/2
szukany iloczyn=-4*4*(-√2/2)=8√2