How do you combine like terms in #78m - 8( 9+ 5m ) + 30#?

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Answer 1 · 2017-01-05T14:48:42

Expand the terms in parenthesis, group like terms and then combine the like terms. See full process below.

First, we will expand the terms in parenthesis, being sure to pay special attention to the signs:

#78m - 8(9 + 5m) + 30 ->#

#78m color(red)(-) 72 color(red)(-) 40m + 30#

Now we can group the like terms:

#78m color(red)(-) 40m color(red)(-) 72 + 30#

And now we can combine the like terms:

#(78 color(red)(-) 40)m color(red)(-) 42#

#38m color(red)(-) 42#