book Maths Puzzle Numerical Ability

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

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book Other Question

say you have the equation y = x^3 - 3. How would you solve the y-intercept, the x-intercept and the vertex to this equation? How many ways can X be written as the sum of consecutive natural numbers