exam Maths Puzzle Numerical Ability

Factor the polynomial.

4s + 6st - 14st squared

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exam Other Question

Im thinking of a number
when i subtract 25 from the number the square it the answer
i get is the same as
when i square the number the subtract 25 from the answer

what is my number? HELP!! How do I find the domain, the horizontal and vertical asymptote, and what values of x would not be allowed of the following rational function:
3x^2 - 2x + 4 / 2x.

Thank