exam Maths Puzzle Numerical Ability

Find the following if f(x) = 5x -1 f(a-2)

a-2 = 5(a-2) - 1
a-2 = 5a -10 - 1
-2 = -4
1 = 2

Double checking to see if I did these right

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exam Other Question
Can this be factored? x^2+4 i would like you to help me on this problem.
it is dealing with fractions in the substitution method.

solve by the substitution method:
m over 3 +