exam Maths Puzzle Numerical Ability

I need to evaluate the function at the given expression, I need to find f (k-1) when f (x)=3x2-5x-4

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exam Other Question

If the product of two consecutive odd integers is decreased by one-third the lesser integer, the result is 250. Find the integers. How do you find all real numbers in this solution?x^3+6x^2+12x +8=0