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x^2+2x-3=0
delta = 2-4*1*(-3)= 16
x1= (-2-4)/2 => x1=-3
x2= (-2+4)/2 => x2=1
2)
x^2>=15-2x
x^2+2x-15>=0
delta=64
x1=-5
x2=3działu
x∈ (-nieskończoności , -5) v (3, + nieskońsczoności)