z3-z2+7z(2z+3)
Apply the distributive property.
z3-z2+7z(2z)+7z⋅3
Multiply z by z.
z3-z2+7⋅2z2+7z⋅3
Multiply 3 by 7.
z3-z2+7⋅2z2+21z
Multiply 7 by 2.
z3-z2+14z2+21z
z3-z2+14z2+21z
Add -z2 and 14z2.
z3+13z2+21z
Multiply z^3-z^2+7z(2z+3)
Multiply z^3-z^2+7z(2z+3)