exam Maths Puzzle Numerical Ability

what is the vertical asymptotic line of
y=(x^3-3x^2)/(9-x^2)
what is the difference between x=3 and x=-3 ?
please explain.

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exam Other Question

a)The Function C(X) = 25x + 80000 express the total cost C(x) in ( K $) of manufacturing x units of a product . if the maximum number of units which can be produced equals 20,000 find the determinant and state whether the matrix has an inverse.

13,3
16, 4