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September 18, 2014

September 18, 2014

Posted by **Anonymous** on Monday, April 1, 2013 at 5:09pm.

3√z+1=-3

How do I do this problem? Thanks for your help.

- college algebra -
**Steve**, Monday, April 1, 2013 at 5:34pm3√z+1 = -3

3√z = -4

Now, √z is interpreted to be positive

√4 = 2, not ±2

so, there is no solution to the equation

3√z = -4

since √z is positive

However, we can go on to say that

3√z = -4

9z = 16

z = 16/9

But, this is really a spurious solution, since

3√(16/9)+1 = 3(4/3)+1 = 4+1 = 5

We cannot use -4/3 as √(16/9) unless specifically indicated.

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