exam Maths Puzzle Numerical Ability

If f(x)=x^4-x+2, then f(-x)=

This is the problem and I cannot find the answer.

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exam Other Question

At 10:00 a.m. planes leave an airport. If the northbound plane flies at 280 mph and the southbound at 320mph, at what time will they be 1,000 miles apart? Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides --> 6

Help with this equation would be appreciated.