Question

(x+1)²-x=7 alguem poderia mim ajudar??

Answer 1

x^2+2x+1-x=7
x^2+x=7-1
x^2+x=6
x^2+x-6=0
∆=1-4•1•(-6)
∆=1+24
∆=25
x=[1(+ou-)√25]/2
x1=(1+5)/2
x1=6/2
x1=3

x2=(1-5)/2
x2=-4/2
x2=-2