Find the Quadratic Constant of Variation y=x square root of 4-x^2

Math
y=x4-x2
Simplify x4-x2.
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Rewrite 4 as 22.
y=x22-x2
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=2 and b=x.
y=x(2+x)(2-x)
y=x(2+x)(2-x)
The given equation y=x(2+x)(2-x) can not be written as y=kx2, so y doesn’t vary directly with x2.
y doesn’t vary directly with x
Find the Quadratic Constant of Variation y=x square root of 4-x^2

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