exam Maths Puzzle Numerical Ability

Multiply, using the vertical method.

(2r - 3s)(4r^2 + 6rs + 9s^2)

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exam Other Question

I need help trying to solve this problem.
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12+x-x^2 x^2-9

Sure hope I did this right. This problem cam from the 10th Edition of Introductory to Algebra by Mar 20 simplify: 24s/3s