Again, to factorize; not solve..

$\displaystyle

x^(3a+2) + 3x^(2a+2) - 5x^2

$

$\displaystyle

-5x^2 + x^(3a+2) + x^(2a+2)

$

$\displaystyle

x^-0.5( -5x^(2.5) + 3^(2a+2.5) + 1^(3a+2.5))

$ *Not too sure about this step, went off-track here, i think..(Speechless)