exam Maths Puzzle Numerical Ability

Can someone help me on this problem?

Given g(x) = 3x + 2,
I need to find g(4a)

Thanks allot,
Ashley

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exam Other Question

I dont understand

"The degree three polynomial f(x) with real coefficients and leading coefficient 1, has 4 and 3+i among its roots. Express f(x) as a product of linear and quadratic polynomials with real coefficients."
Factor the polynomial of 5x^2-125