exam Maths Puzzle Numerical Ability

Given f(x)= {2x-1 x<3
{-2 x>or=to3

Evaluate f(-1)
Evaluate f(3)
Evaluate f(5)

Thanks

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exam Other Question

3x + y = 2 and 2x-y=3 find two imaginary numbers in the form a + bi whose product = 17. Neither a nor b may equal zero.

Has me stumped. Any help is appreciated.