SOLUTION: Solve 2r-³=- 16

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Question 1174242: Solve 2r-³=- 16
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(53763) About Me  (Show Source):
You can put this solution on YOUR website!
.

You start with


    2r%5E3 = -16


Divide both sides by 2


    r%5E3 = -16/2 = -8


Take cube root from both sides


    r = root%283%2C-8%29 = -2.


ANSWER.   The solution is r= -2.   It is a unique solution to this equation over real domain.

Solved.



Answer by MathTherapy(10810) About Me  (Show Source):
You can put this solution on YOUR website!
Solve 2r-³=- 16 
Answer depends on whether this is: 

If FORMER, then it's -+1%2F2, but if the LATTER, it's - 2.