book Maths Puzzle Numerical Ability

can you explain the concepts that are needed to solve problems that involve matrices?

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Please help i'm very comfused!
Harold camped out in the desert one evening. In the morning, he jumped into his car to go home. He drove at 30 mph headed for the nearest highway, w
2. Multiply and simplify:


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

___________ ___________

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