Find the constant term in the expansion of (2z - 1/sqrt(z) + z^2)^9
\(\phantom{(2z - 1/sqrt(z))^9}\)
-5376 z^(9/2) - 1/z^(9/2) - 2016 z^(3/2) - 144/z^(3/2) - 2304 z^(15/2) + 512 z^9 + 4608 z^6 + 4032 z^3 + 18/z^3 + 672 The constant term is 672
