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9+12x+x² = 9x²+12x+4+10
8x²+5=0
brak rozwiazań
b) (5x-2)(3-x)=-6(1-x)(1+x)
15x-5x²-6+2x=-6+6x²
-11x²+17x=0
x(-11+17x)=0
x=0 ∨ -11+17x=0
x=0 ∨ 17x=11
x=0 ∨ x=11/17