exam Maths Puzzle Numerical Ability

By using the Factor Theorem, Find the Prime factors of the polynomial:

x^3 - x^2 - 17x - 15

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exam Other Question

Geometry. For the floor plans given in exercise 27, determine whether the side
through the points (2, 3) and (11, 6) is perpendicular to the side through the points
(2, 3) and (-3, 18). 3w-1 - 2-w - w (these are the numerators)
2w^2 + w-3 w-1 1-w (these are the denominators)

Here's what I have but it seemed too easy! Is this