Simplify \(\frac{324 - 4x^2}{2x + 18}\)
Factorize completely \(y^3 -4xy + xy^3 - 4y\)
Solve the pair of equation for x and y respectively \(2x^{-1} - 3y^{-1} = 4; 4x^{-1} + y^{-1} = 1\)