Question

решите через дискриминант х^2-x-30=0

Answer 1

Д=1+4*30=121
√Д=11
х1=(1+11)/2=6
х2=(1-11)/=-5

Answer 2

$x^{2}-x-30=0$
$D=b^{2}-4ac=-1^{2}-4*1*(-30)=1+120=121$
$x_{1}=\frac{-b+\sqrt{D}}{2a}=\frac{-(-1)+\sqrt{121}}{2*1}=\frac{1+11}{2}=\frac{12}{2}=6$
$x_{2}=\frac{-b-\sqrt{D}}{2a}=\frac{-(-1)-\sqrt{121}}{2*1}=\frac{1-11}{2}=\frac{-10}{2}=-5$