Answer :
2 - z + 5z × 3
4 z
2 - z + 15z
4 z
z(4)(z) + 15z(z)(4)
4(z) 4(z)
4z² + 60z²
4z 4z
64z²
4z
16z
4 z
2 - z + 15z
4 z
z(4)(z) + 15z(z)(4)
4(z) 4(z)
4z² + 60z²
4z 4z
64z²
4z
16z