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#