exam Maths Puzzle Numerical Ability

-2(x+6) + 3(2-x)

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exam Other Question

Given f(x) = 2x + 5, find f(a - 1).
These are my choices
2a + 3
2a + 4
a + 6
a + 3 find a unit vector in the direction of v: v = 4i + 2j.