exam Maths Puzzle Numerical Ability

Here is another one I can not figure out. I am confused on what procedure. Can someone help me.
Multiply the following:

(x/3 + 3/4)(3x/4 - 3/5)

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exam Other Question

Please help me solve for x. I keep getting stuck.
f(x)= x^4+x^2-12. Write (x^2+4)^4/3+x * 4/3(x^2+4)^-1/3 * 2x as a single quotient containing only positive exponents and/or radicals. The closest i found was 1/2 where the 4/3 is and the 2 canceled