Answer:
[tex] 6.- 4y {z}^{2} \\ 7. \: 4 {x}^{2} - 20x + 25 \\ 8. \: 3 {x}^{2} - 23x + 30 \\ 9. \: 15 {x}^{2} + 22x - 5 \\ 10. \: 2 {x}^{3} + 5 {x}^{2} - 18x - 45[/tex]
Step-by-step explanation:
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