Wednesday

August 27, 2014

August 27, 2014

Posted by **Luci** on Thursday, October 23, 2008 at 10:49pm.

The answer says it's not possible; why, I don't understand this.

- Math -
**Count Iblis**, Thursday, October 23, 2008 at 11:08pmThe problem is really how to define fractional powers like x^(1/2).

You want it to define in such a way so that the usual rules for taking powers still hold. E.g.:

(x^a)^b = x^(ab)

This means that you want to define

x^(1/2) such that:

(x^(1/2))^2 = x

So, x^(1/2) should be the square root of x. But this is only defined for positive x. The square of a real number is always positive, so if x is negative, no real number can be its square root.

- Math -
**Luci**, Thursday, October 23, 2008 at 11:14pmoh, okay, I see; thank you very much! :D

- Math -

**Related Questions**

math,correction - the problem reads: evaluate sqrt (-4) if possible. my answer: ...

algebra - Coulld someone take the time and check my answers please. 11) without ...

Calculus (check my answers) - 10) Use the information to evaluate and compare ...

Math Algebra - Use Descartes' Rule of Signs to determine the possible number of ...

Math - Real number system - Solve the following equation in the real number ...

Adv. Math. - Find the number of possible negative real zeros for f(x)=6+x^4+2x^2...

college algebra--please help - what does Descartes rule of signs tell you about ...

Pre-Calculus-check answers - Find the number of possible negative real zeros for...

Pre-Calculus-check answers - Find the number of possible negative real zeros for...

Pre-calculus-check answers - Find the number of possible negative real zeros for...