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3-x²+4x-2=0
-x²+4x+1=0
Δ=16+4=20
√Δ=2√5
x=-1/2(-4-2√5)=2+√5 v x=2-√5
w gimnazjum bez Δ
x²-4x-1=0
x²-4x+4-5=0
(x-2)²-5=0
(x-2-√5)(x-2+√5)=0
x-2-√5=0 v x-2+√5=0
x=2+√5 v x=2-√5
b)
2x+5x-5=3x
7x-3x=5
4x=5
x=5/4
x=1,25