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Δ=b²-4ac=16+240=256 √Δ=16
x1=[-n/√Δ]/2a=[4-16]/4=-3 x2=[-b+√Δ]/2a=[4+16]/4=5
b) 2x²+3x+2=0
Δ=9-16=-7
Δ<0
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