exam Maths Puzzle Numerical Ability

f(4) = 3(4) + 2

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exam Other Question

x=-3**2**2; write out an equation for f(x).
x -2 -1 0 1 2
f(x) -5 -2 1 4 7


I am deployed to Iraq, and all of our class is via the internet,this question has me stumped, can you plesae assist me?