## College Algebra (11th Edition)

$z^{4}$ - 9$z^{3}$ + 12$z^{2}$ + 8z
1. Apply the distributive property. -$z^{3}$(9 - z) + 4z(2 + 3z) = -9$z^{3}$ + $z^{4}$ + 8z + 12$z^{2}$ = $z^{4}$ - 9$z^{3}$ + 12$z^{2}$ + 8z