Question 900760
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Hi 
x^2+(x+7)^2=13^2      Note: (x+7)^2 = (x+7)(x+7) =  x^2 + 14x + 49
 x^2+ x^2 + 14x + 49 =169
2x^2 + 14x = 169-49
2x^2 + 14x = 120
x^2 + 7x - 60 = 0
 *[invoke quadratic "x", 1, 7,-6]