exam Maths Puzzle Numerical Ability

Please help me solve this problem.

5x^2-19x-10

(i am not sure how to sqaure something on the computer so i made ^2=raised to the 2nd power)

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exam Other Question
f(x)= x2 - 7x + 10; find (a) f (0), (b) f (5), and (c) f (-2) A wire of length x is bent into the shape of a circle. Express the circumference C of the circle as a function of x.