exam Maths Puzzle Numerical Ability

I need help with this: find the polynomial written as a product of linear factors: f(x)=2x^3+5x^2-11x+4

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exam Other Question

The following picture shows a circular driveway with a flowerbed that lies in the middle. A family is planning to asphalt the driveway and knows the diameter of the whole circle is 1/4=3-2x-1/x+2