book Maths Puzzle Numerical Ability

What are all possible zeros for this polynomial and how do you get them?
P(x)= 14x^3+56x^2+2x-7

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book Other Question

Five times the opposite of a number was increased by 25. This was 90 times greater than 8 times the number. What was the number? PQRS in a parallelogram,Q and S are joined to any point M on the diagonal PR of the parallelogram.Prove that area of the triangle PQM=area of triangle PSM