exam Maths Puzzle Numerical Ability

Complete the square and graph

y = -x^2 + 8x -12

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exam Other Question

the length of a rectangular field is 75yd.This is 3yd more than twice the width.how wide is the field?? This problem is not in the book.
15/x - 15/x+2 =2 Can you help me solve this? Thanks Rhee