Дееескременант
x^2+3x-4=0

х²+3х-4=0а=1, b=3, c=-4D = b²-4ac = 3²-4*1*(-4) = 9+16 = 25x₁ = -b-√D / 2a = -3-√25 / 2*1 = -3-5 / 2 = -8/2 = -4x₂ = -b+√D / 2a = -3+√25 / 2*1 = -3+5 / 2 = 2/2 = 1