х^2+х-20=0;
x^2+5x-4x-20 = 0;
x*(x+5)-4(x+5) = 0;
(x+5)*(x-4) = 0;
x+5 = 0;
x-4 = 0;
x = -4, -5;
Ответ: -4, -5.
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х^2+х-20=0;
x^2+5x-4x-20 = 0;
x*(x+5)-4(x+5) = 0;
(x+5)*(x-4) = 0;
x+5 = 0;
x-4 = 0;
x = -4, -5;
Ответ: -4, -5.