Rewrite the expression in long division form .

Divide the first term of the dividend by the first term of the divisor

So the first term of the quotient is z³. Multiply the (z – 1) by z³ and subtract.

Divide the first term of the next row by the first term of the divisor

So the next term of the quotient is . Multiply the (z – 1) by and subtract.

Divide the first term of the next row by the first term of the divisor

So the next term of the quotient is . Multiply the (z – 1) by and subtract.

The quotient is  z³ – 2z² – 4, and the remainder is 0. Therefore,

.