exam Maths Puzzle Numerical Ability

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How do you determine if a polynomial is the difference of 2 squares?

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exam Other Question

the length of a rectangular playing field is 5 ft less than twice its width. if the perimeter of the playing field is 230 ft. find the length and width of the field. Simplify and evaluate:
(42x3y-2z-3/x-5y8z-9)2