book Maths Puzzle Numerical Ability

2. Multiply and simplify:

x^2-x-20 * x^2+7x+10

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x^2-3x-10 x^2+4x-5

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book Other Question

I need help in answering this problem:
(x-5)(2x^2-7x-2)
I have to simplify the problem and write it in standard form. find the area of a cylinder with a radius if 5 centimeters and a height of 9 centimeters