book Maths Puzzle Numerical Ability

Where do I start? I am so lost... here is the problem...

Given f(x)=6x^2 + 5x - 4 find [f(x+h)-f(x)] / h

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book Other Question

6^-2y^3z^-2/-2x^4y

please simplify and write the answer without negative exponents The sum of the ages of a husband and wife is 98 years. He is twice as old as she was when he was the age she is today. What are their ages?