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

If f(x) =x^2 + 5, find f(a+h)-f(a) A motorboat can go 8 miles downstream on a river in 10 minutes. It takes 30 minutes for this boat to go back upstream the same 8 miles. Find the speed of the boat in still water.