How do you simplify #3- sqrt[81]+(-2)^3#?

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Answer 1 · 2018-04-07T18:39:20

#-14#

Here's how I did it:

#3-sqrt81+(-2)^3#

First, we know that #(-2)^3# is the same thing as:
#(-2)(-2)(-2) => (4)(-2) => -8#

Let's put this back into the expression:
#3-sqrt81+(-8)#

#3-sqrt81-8#

#-5-sqrt81#

We also know that #sqrt81 = 9#, so:
#-5-9 =-14#

Hope this helps!