Factor each expression:

$($a$)4x^2-25$

$($e$)3x^{\frac{3}{2}}-9x^{\frac{1}{2}}6x^{-\frac{1}{2}}$

$($b$)2x^{2}5x-12$

$($f$)x^{3}y-4xy$

$($c$)x^3-3x^2-4x12$

$($g$)e^{2x}-5e^{x}6$

$($d$)x^{4}27x$

$($h$)tanx-secx$