persamaan kuadrat di ketahui akar akar nya. x1=-5 danx2=-6

X1+x2=-5-6=-11
X1x2=(-5)(-6)=30
Pk===>  x^2-(x1+x2)x+x1x2=0
                x^2+11x+30=0

x1 = -5
x2 = -6

(x - (-5)) (x - (-6))
= (x + 5) (x + 6)
= x² + 11x + 30