Question

(x + 1) ² = 9
.......

Answer 1

(x+1).(x+1)=9

x²+1x+1x+1=9

x²+2x+1-9=0

x²+2x-8=0

∆=2²-4.1.(-8)
∆=4+32
∆=36

x= -2±√36/2.1
x= -2±6/2
x1= -2+6/2=4/2=2
x²=-2-6/2=-8/2=-4