Answer:
Step-by-step explanation:
-5(3m² + 7n²) + 8n²
Expand brackets.
-15m² + -35n² + 8n²
Combine like terms.
-15m² + -27n²
[tex]\boxed{\red{= - 3(5 {m}^{2} + 9 {n}^{2} )}}[/tex]
[tex] - 5(3 {m}^{2} + 7 {n}^{2} ) + 8 {n}^{2} \\ - 15 {m}^{2} - 35 {n}^{2} + 8 {n}^{2} \\ = - 15 {m}^{2} - 27 {n}^{2} \\ = - 3(5 {m}^{2} + 9 {n}^{2} )[/tex]
