What is $4(2m- n)- 3(2m- n)$ when $m=-15$ and $n=-18$ ?

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Answer 1 · 2018-03-25T14:15:06

$-12$

When $m=-15$ and $n=-18$ ,

$4(2m-n)-3(2m-n)$

$=4[2(-15)-(-18)]-3[2(-15)-(-18)]$

$=4(-30+18)-3(-30+18)$

$=4(-12)-3(-12)$

$=-48+36$

$=-12$

Note: To work things out faster, we can also furthur factorize this question as follows:

$4(2m-n)-3(2m-n)$

$=(4-3)(2m-n)$

$=2m-n$

$=2(-15)-(-18)$

$=-30+18$

$=-12$

What is 4(2m- n)- 3(2m- n)4(2m- n)- 3(2m- n) when m=-15m=-15 and n=-18n=-18?