Question

x^2+a^2=(a+x)^2-a(a-1)

Answer 1

x²+a²=(a+x)² -a(a-1)

x²+a² =a²+2ax+x²-a²+a
x²+a²=2ax+x²+a
a²=2ax-a
a²=a(2x-1)
a=2x-1
a+1/2=x