exam Maths Puzzle Numerical Ability

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FIND ALL ROOTS OF THE POLYNOMIAL x3-x2+16x-16.

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exam Other Question

one number is 12 more than the other. The larger number is 7 times the smaller number. Find the number.

thank you very much in advance!!!. Can someone help me with this question please: Simplify the complex rational expression 3x/x-4 +1 / 15/x^2-16 + 1