Question

Помогите решить x²+px-9=0

Answer 1

Д=b^2-4ac= p^2-4*(-9)=p^2+36>0, 2к
x1= -b+√Д/2а= (-p+√p^2+36)/2= 36/2=18
x2= (-p-√p^2+36)/2=(-2p+6)/2=2(-p+3)/2= (-p+3)/2