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\frac{4\left(x+1\right)^{2}}{4}=\frac{8}{4}
Divide both sides by 4.
\left(x+1\right)^{2}=\frac{8}{4}
Dividing by 4 undoes the multiplication by 4.
\left(x+1\right)^{2}=2
Divide 8 by 4.
x+1=\sqrt{2} x+1=-\sqrt{2}
Take the square root of both sides of the equation.
x+1-1=\sqrt{2}-1 x+1-1=-\sqrt{2}-1
Subtract 1 from both sides of the equation.
x=\sqrt{2}-1 x=-\sqrt{2}-1
Subtracting 1 from itself leaves 0.