exam Maths Puzzle Numerical Ability

Need help with these problems. Not understanding the process on how to solve.
1. Simplify the rational expression:
x2 - 6x + 5
x2 - 25

2. Divide:
x2 - 9x + 8 � x2

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exam Other Question

The length of a rectangle is 4 cm less that three times its width. If the length is increased by 8 cm and the width is decreased by 2 cm, the perimeter will be 100 cm. Find the dimensions of the orifinal rectangle. D-16, Construction: Concrete weighs 150 lb/cu ft. What is the weight of a concrete wall 18 ft. long, 4 ft 6 in high, and 8 in. thick?