exam Maths Puzzle Numerical Ability

Find the roots of the polynomial x3 -x2 +16x -16

Please explain also.

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exam Other Question

Solve each of the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x +2y = 7
Y = -5x + 3 What is the coordinate of the image of the point (4, 2) dilated with center at the origin, scale factor of 1/2?

1. (8, 4)
2. (-4, 2)
3. (2, 1)
4. (2, 4)