posted by tara on .
if you have a problem where you are multiplying numbers with exponents (both positive and negative) and your answer ends up with a negative exponent what is the reason you make a fraction out of it and put it on the bottom as a positive?
why cant you have a negative exponent in an answer?
You are right. You can write the answer either way.
For example, if a and b are both positive,
x^a*x^-b = x^(a-b) or 1/x^(b-a)
but why cant there be a neg. on top? why do u move it to the bottom and make it positive?(note:neg6,5,2 and 4 are exponents)
the final answer will be 28b9
my question was why do you move the "a" negative 5 to the bottom and make it a postive "a" 5
I hope i'm wording this right.
You can. Just move the exponent up or down between numerator and denominator and change the sign. It's the same number either way.