exam Maths Puzzle Numerical Ability

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1-2/x-8/x^2=0

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exam Other Question

The length of a rectangle is 3 in. more than twice its width. If the perimeter of the rectangle is 36 in., whatt wioud be the width of the rectangle. Factor trinomials.
2x^2+7x-15
(2x )(7x )
How?