A right angled triangle has a base that is 7 centimeters longer than its height, h centimeter. The hypotenuse of the triangle is 23 centimeters
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h^2+(h+7)^2=23^2=529 (Pythagoras).

h^2+h^2+14h+49=529; 2h^2+14h=480; h^2+7h=240, h^2+7h-240=0 QED
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