You can put this solution on YOUR website! SETTING Y=0 & SOLVING FOR X GIVES THE X INTERCEPT(S).
y=x^2+2x-3
0=X^2+2X-3)
0=(X+3)(X-1)
X+3=0
X=-3 ANS (-3,0) ONE X INTERCEPT.
X-1=0
X=1 (1,0) THE SECOND X INTERCEPT. (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x^2 +2x -3).