Question

please solve this ☝️☝️☝️☝️☝️​

Answer 1

Step-by-step explanation:

$(72 {z}^{2} - 45z + 4) - ( - 42 {z}^{2} + 30z - 17)\\</p><p>72 {z}^{2} - 45z + 4 + 42 {z}^{2} - 30z + 17 \\ 72 {z}^{2} + 42 {z}^{2} - 45z - 30z + 4 + 17 \\ 114 {z}^{2} - 75z + 21$