book Maths Puzzle Numerical Ability

Let f(x) = 2x + 1 and g(x) = x^2 - 4 and find the following:

(fg)(x)

(g of f)(x)

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book Other Question

factor by grouping x^3-3x^2+4x-12 having trouble creating a graph that shows two variables of a persons progression of their guitar playing skills. Please help.