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81-x²=0
(9-x) (9+x)=0
x=9 ∨ x=-9
Δ=0+324=324
x1= 0-18/2=-9
x2=0+18/2=9
c)-3x²-7=0 //-3
x²+7/3=0
x²=-7/3
sprzeczność
Δ=0-84=-84
sprzeczność
d)1/2x²+8x=0
x(1/2x+8)=0
x=0 ∨ x=16
Δ=64-0=64
x1=8-8/0=0
x2=8+8=16