book Maths Puzzle Numerical Ability

Question - How do I go about solving this problem??

3(4-6)^2-2(4-3)

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book Other Question

what is are the coordinates of the vertex for y=-xsquared-4 let f(x)= 3xsquared - 1 and g(x) = 2x + 5

find f(g(-1)) and g(f(-1))