exam Maths Puzzle Numerical Ability

Find all roots of the polynomial x^3-x^2+16x-16.

Thanks Very Much.

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exam Other Question

How do I algebraically find x when x^4=16? Multiply : (4x^2y^2), (6ax^2y^6)

The answer I came up with is: 24ax^4y^12
Explanation for my answer: I multiplied 4*6, then x^2 and left the "a" as is. I also muliplied y^2 * y^6. Please help me thank you!