How do you combine like terms in #-5( - 1- 4m ) - 8m ( - 8m + 5)#?

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Answer 1 · 2018-03-02T02:13:17

The asnwer is #64m^2-20m+5#

Multiply the terms outside the brackets by each of the terms inside the first brackets:

#(-5)*(-1)+(-5)*(-4m)#

#=5+20m#

Do the same with the second brackets:

#(-8m)(-8m)+(-8m)(+5)#

#=64m^2-40m#

Now, add everything together

#64m^2-40m+5+20m#

#=64m^2-40m+20m+5#

#=64m^2-20m+5#

And there we have the answer.