How do you evaluate #-11+ 9( 8- 7) #?

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Answer 1 · 2017-06-28T05:10:54

The answer is #-2#.

#-11+9(8-7)#

First we solve what is in the brackets.

#color(red)(8-7=1)#

#:. -11+9(1)#

Now we open the brackets and multiply #9# and #1#.

#color(red)(9xx1=9)#

#:.-11+9#

Now, to make subtraction easier, we keep the minus sign outside the brackets. That will change the plus sign before the #9# to a minus sign.

#-(11-9)#

Since #11-9=2#, we get:

#-(2)#

Removing the brackets, we get:

#-2#