Question

I’ll give brainliest, I need help with 9 and 10

Answer 1

Answer:

9. $\\-(2b-7a)(b+a)$

10. $mn(m^{2}-3mn+8n^{2} )$

Step-by-step explanation:

9. $-2b^{2} +5ab+7a^{2}$

Write 5ab as a difference.

$-2b^{2} -2ab+7ab+7a^{2}$

Factor out the greatest common factor (GCFs).

$-2b(b+a)+7a(b+a)\\\\-(2b-7a)(b+a)$

10. $-3m^{2} n^{2} +8mn^{3}+m^{3}n$

Factor out the GCF which would be mn.

$-mn(3mn-8n^{2}-m^{2} )$

Rewrite.

$mn(m^{2}-3mn+8n^{2} )$