Question #62df1

1 Answer
Jan 19, 2018

#-9k#

Explanation:

#-k-(8k)#

Remove the brackets.

#-k-8k#

Place both terms into a common bracket with the minus sign outside. The minus sign preceding #8k# will change to a plus sign.

#-(k+8k)#

Add the terms and then remove the brackets, retaining the minus sign.

#-(9k)#

#-9k#