Question

Решите уравнение $x^{2}$-20-х=0

Answer 1

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Answer 2

$x^{2} -20-x=0\\x^{2} -x-20=0\\D=b^{2}-4ac\\D=(-1)^2-4*1*(-20) =81\\x1=\frac{1+9}{2}=5 \\x2=\frac{1-9}{2} =-4$

Ответ: x1,x2 = (5;-4)