book Maths Puzzle Numerical Ability

Please Help me with this equation:(4n-8m)(4n+8m)

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book Other Question

Find the center (h,k) of the ellipse with the equation
9x^2-18x+4y^2+16y=11

Thanks:) The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle.