exam Maths Puzzle Numerical Ability

I have a question that states: find f(-2) for the function f(x)=2^4x-1

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solve.
two planes travel toward each other from cities that are 780km apart at rates of 190 km/h and 200km/h. They started at the same. In how many hours will they meet? Please help to simplify

3i - 2i^2 + 3

DIvided by

the square root of -16 - the square root of -2 times the square root of -2