Question 301438
x^2+(x+2)^2=20
x^2+x^2+4x+4=20
2x^2+4x+4-20=0
2(x^2+2x-16)=0
2(x^2+2x-8)=0
2(x+4)(x-2)=0
x-2=0
x=2 ans.
2+2=4 ans.
Proof:
2^2+4^2=20
4+16=20
20=20