exam Maths Puzzle Numerical Ability

I dont even know where to start

Find the value of the polynomial x3 - 4x when x = -2.

A) -2
B) 0
C) 2
D) 14

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exam Other Question

A regular octagon is inscribed in a circle of radius 15.8 cm. Find the perimeter of the octagon. The average of four numbers is 98. If three of the numbers are 86, 87, and 91, what is the fourth number?