exam Maths Puzzle Numerical Ability

x2-64
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x2-8x+16

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The width of a rectangle is 2 less than twice its length. If the area of the rectangle is 106cm^2 , what is the length of the diagonal? how could i make a system of equations (2) for this problem: sue is 4 years younger than sally. in 3 years sally will be twice as old as sue. how old are they now?