laurenbrasgall laurenbrasgall

03-09-2015
Mathematics

contestada

3-2(m+4)=15 how do I do this

Respuesta :

Panoyin Panoyin

03-09-2015

    3 - 2(m + 4) = 15
3 - 2(m) - 2(4) = 15
   3 - 2m - 8 = 15
   3 - 8 - 2m = 15
   -5 - 2m = 15
   + 5     + 5
      -2m = 20
      -2    -2
   m = -10

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03-09-2015

Multipy -2(m+4) first
Then you have
3-2m-8=15
Subtact 3 and 8 from each side
-2m=4
Divide by -2 on both sides
m=-2
Then plug in -2 for m to check

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