book Maths Puzzle Numerical Ability

How many ways can X be written as the sum of consecutive natural numbers

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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:)
Multiply or Divide,show each step to answer

4x^2-1
---------
x^2-2X-1

divided by

x-2
_____
x^2+1