решите приведенное квадратное уравнение x2 + 2x - 8 = 0
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D = b^2 - 4ac = 4 - 4*1*(-8) = 4 + 32 = 36
x1 = (-2 + 6)/2 = 4/2 = 2
x2 = (-2 - 6)/2 = -8/2 = -4
x-2=0 x+4=0
x=2(первый x) x=-4(второй x)