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How do you evaluate #-7\times 7+ 9\times \frac { - 1} { - 1}#?

1 Answer

Feb 28, 2017

#-40#

Explanation:

#-7 xx 7+9 xx (-1)/(-1)#

#:.=(-7 xx 7)+(9 xx (-1)/(-1))#

#:.=-49+(9 xx cancel(-1)^1/1 xx 1/cancel(-1)^1)#

#:.=-49+(9 xx 1)#

#:.=-49+9#

#:.=-40#

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