Question #62df1

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Answer 1 · 2018-01-19T15:43:28

#-9k#

#-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#