Question

83=(x-2)² + (x+2)² + x²

Answer 1

83= x² + 4 + x² + 4 + x²
83= 3x² + 8
83-8= 3x²
75= 3x²
75/3= x²
25 = x²
$\sqrt{25}$ =x
5= X

Answer 2

83=x²+4+x²+4+x²
83-4-4=3x²
75=3x²
75/3=x²
25=x²
√25=√x²
5=x
S={-5,5}