exam Maths Puzzle Numerical Ability

need to find 3 points that satisfy this function f(x) = |x-3| -4

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exam Other Question

A garden area is 30ft long and 20ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft2, what is the width of the path? How would you solve this equation?

a^2-3=2a