# Negative Exponent

• Dec 22nd 2008, 07:06 PM
evenstar7139
Negative Exponent
I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

What would I have to do with this to get rid of the negative exponent? -2x^3
• Dec 22nd 2008, 07:13 PM
tester85
Do you mean 2x^-3 then it is equivalent to 1/2x^3

Quote:

Originally Posted by evenstar7139
I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

What would I have to do with this to get rid of the negative exponent? -2x^3

• Dec 24th 2008, 09:35 AM
Coele
Quote:

Originally Posted by evenstar7139
I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

What would I have to do with this to get rid of the negative exponent? -2x^3

if you mean: (2x^-3) then:
simple rules:

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

a minus sign before your exponent just means you need to write 1/ (by whatever you need to calculate)

ex:
x^-3 = (1/x)^3
25^-2 = (1/25)²
4^(-1/2) = (1/4)^(1/2) = square root out of 1/4
...

if you mean (-2x)^3 then its simply (-1)^3 . (2x)^3 = ...
• Dec 29th 2008, 02:49 AM
HallsofIvy
Quote:

Originally Posted by evenstar7139
I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

What would I have to do with this to get rid of the negative exponent? -2x^3

-2x^3 does NOT have a negative exponent to get rid of. (-2x)^3 also does not have a negative exponent but can be written -8x^3.
• Jan 1st 2009, 03:36 PM
Russian
Usually when there is a negative exponent ,you just flip the equation:
example 5 to negative one power = one fifth
the power becomes positive.
• Jan 2nd 2009, 07:44 AM
HallsofIvy
Quote:

Originally Posted by tester85
Do you mean 2x^-3 then it is equivalent to 1/2x^3

Actually, it's not. 2x^-3 is equivalent to 2/x^3. If it were (2x)^-3, then it would be equivalent to 1/(2x^3).