Question

(x+1) ² + (x-1)²=10 ????

Answer 1

$(x+1)^2+(x-1)^2=10 \\ \\ x^2+2x+1+x^2-2x+1=10 \\ \\ 2x^2+2=10 \\ \\ 2x^2=10-2 \\ \\ 2x^2=8 \\ \\ x^2= \frac{8}{2} \\ \\ x^2=4 \\ \\ x= \sqrt{4} \\ \\ x_{1} =2 \\ \\ x_{2} =-2$

Answer 2

x²+1+x²+1=10
2x²=10-2
2x²=8
x²=8/2
x²=4
x=√4
x=2