Question 36862
X~2+(X+5)~2=25~2 OR X~2+X~2+10X+25=625 OR 2X~2+10X-600=0 OR X~2+5X-300=0 OR

(X-15)(X+20)=0 OR X=15 & X=-20 
PROOF 15~2+20~2=625 OR 225+400=625 OR 625=625