book Maths Puzzle Numerical Ability

What is a number called that is raised to the second power?

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I tried this, can someone just let me know if I am right?

(x^-1+y^-1)/(x^-1y)
I cancelled out the x^-1, which left me with y^-1/y, which I think is (1/y)/(y)

Thanks!! give the equation of the ellipse with intercepts (4,0), (-4,0),(0,2) and (0,-2).