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x(do kwadratu) +3x -4 = 0
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x²+3x-4=0
Δ=b²-4ac=3²-4*1*(-4)=9+16=25
√Δ=5
x₁=[-b-√Δ]/2a=[-3-5]/2=-8/2=-4
x₂=[-b+√Δ]/2a=[-3+5]/2=2/2=1
(x+4)(x-1)=0
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x²+3x-4=0
Δ=b²-4ac=3²-4*1*(-4)=9+16=25
√Δ=5
x₁=[-b-√Δ]/2a=[-3-5]/2=-8/2=-4
x₂=[-b+√Δ]/2a=[-3+5]/2=2/2=1
(x+4)(x-1)=0