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

can you explain the concepts that are needed to solve problems that involve matrices? 9. McKay Corporation is trying to improve its inventory control system and has installed an on-line computer at its retail stores. McKay anticipates sales of 75,000 units per year