Answer:
9. [tex]\\-(2b-7a)(b+a)[/tex]
10. [tex]mn(m^{2}-3mn+8n^{2} )[/tex]
Step-by-step explanation:
9. [tex]-2b^{2} +5ab+7a^{2}\\[/tex]
Write 5ab as a difference.
[tex]-2b^{2} -2ab+7ab+7a^{2}\\[/tex]
Factor out the greatest common factor (GCFs).
[tex]-2b(b+a)+7a(b+a)\\\\-(2b-7a)(b+a)[/tex]
10. [tex]-3m^{2} n^{2} +8mn^{3}+m^{3}n[/tex]
Factor out the GCF which would be mn.
[tex]-mn(3mn-8n^{2}-m^{2} )[/tex]
Rewrite.
[tex]mn(m^{2}-3mn+8n^{2} )[/tex]
