Question

x(x-2)=12-x решите уравнение

Answer 1

X^2-2x+x-12=0
x^2-x-12=0
d=1^2+4*12
x1=(-b+d^(1/2))/2a=(1+7)/2=4
x2=(-b-d^(1/2))/2a=(1-7)/2=-3