exam Maths Puzzle Numerical Ability

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

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exam Other Question

please simplify this fraction.

6p-18/9p divided by 3p-9/p^2+2p
9:
(x3 + 4x2 - 2x + 5) - (3x3 - 3x2 + x - 2)