Question

add
$2 {m}^{2} + 8m - 9 \: and \: m { }^{2} - 9m - 1$
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Answer 1

Step-by-step explanation:

$2 {m}^{2} + 8m - 9 + {m}^{2} - 9m - 1$

$= 3 {m}^{2} - m - 10$

$= 3 {m}^{2} - (6 - 5)m - 10$

$= (m - 2)(3m + 5)$

$= 3 {m}^{2} - 6m + 5m - 10$

$= 3m(m - 2) + 5(m - 2)$