Question

please help me am stress about it​

Answer 1

Answer:

$\sf{Explaination\:Required\:}\purple{\purple\checkmark}$

$10 {m}^{2} - 9m + 7m { - 3m}^{2} - 5m - 8$

$10 {m}^{2} - 3 {m}^{2} - 9m - 5m + 7m - 8$

$7 {m}^{2} - 7m - 8$