exam Maths Puzzle Numerical Ability

9:
(x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2)

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exam Other Question

I need help solving the following problem:

Find and simplify the difference quotient f(a + h) - f(a) / h, h=(not equal to) 0 for the given function.

Thank you (s^2/r-s)+(r^2/s-r)