exam Maths Puzzle Numerical Ability

I am coming up with 2 different answers on this problem and was wondering if anyone can help me?

Subtract -4x^3 + x^2 - 3x from 4x^3 + 5x^2 - 3x + 5

My answers that I cam

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exam Other Question

One leg of a right triangle is 2 inches smaller than the hypotenuse. The other leg is 5 inches long. What are the lengths of the unknown leg and hypotenuse?

Not sure if I set it up right.

(x+2)^2 + 5^2 = x^2 graph the equation

y=4