sedinalana

Verified answer

X²+6x=a
a²-4(a+1)-17=0
a²-4a-4-17=0
a²-4a-21=0
a1+a2=4 u a1*a2=-21
a1=-3⇒x²+6x=-3
x²+6x+3=0
D=36-12=24
x1=(-6-2√6)/2=-3-√6
x2=-3+√6
a2=7⇒x²+6x=7
x²+6x-7=0
x3=x4=-6 U x3*x4=-7
x3=-7
x4=1