Question 1148735
(x+1)^2=(x-3)^2+x^2
(x^2+2x+1)=(x^2-6x+9)+x^2        square them
x^2+2x+1=2x^2-6x+9          move everything to the right side
0=x^2-8x+8                    then use quadratic formula 



x= 4+2 root 2     or    4-2 root 2

Hope this helps.