Question

найдите корни уравнения х^2+7х-60=0

Answer 1

$x = \frac{ - 7 + - \sqrt{49 + 240} }{2} = \frac{ - 7 + - 17}{2}$
x= -12
x= 5

Answer 2

D=49-4×1×(-60)=49+240=√289=17

x1= -7+17/2=5

x2= -7-17/2=-12