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

1 Answer
Mar 2, 2018

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

Explanation:

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.