book Maths Puzzle Numerical Ability

Please Help me Factor X^2-5X+8^-2=2^-2

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book Other Question

Find the dimensions of a rectangle whose perimeter is 578 cm if the ratio of length to width is 9 : 8. The student-teacher ratio for Washington High was reported to be 27.5 to 1. If there are 42 teachers, then how many students are there?