exam Maths Puzzle Numerical Ability

If f(x) = 2x + 3 and g(x) = (x - 3)/2, what is the value of f[g(-5)]?

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please help me solve

x/2 + 5x/10 = -2

thank you so much I am not sure how to complete.
Thanks
f(x) = 3(x-3)^2
The vertex is:
The line of symmetry is: