book Maths Puzzle Numerical Ability

Given f (x) = 5x^2 - 12x + 3, find f (-2)
A) -41 B) -43 C) 47 D) 49

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Can someone please help me with this problem. Thanks
A rectangular piece of tin measures 36 inches by 25 inches. A square measuring 4 inches is cut out of each corner and the sides are folded to form a box. What is the volume of the box? if x < -1 then /x/ _ 1