Question 305485
X^2+(X+1)^2+(X+3)^2=38
X^2+X^2+2X+1+X^2+6X+9=38
3X^2+8X+10-38=0
3X^2+8X-28=0
(3X+14)(X-2)=0
X-2=0
X=2 ANS.
PROOF:
(2)^2+(2+1)^2+(2+3)^2=38
4+3^2+5^2=38
4+9+25=38
38=38