Elementary Algebra
posted by Wanda .
I need an explanation on how to work out
negative exponents. Example: (3a^2b^3)^2

(3a^2b^3)^2 =
1/(3a^2*b^3)2 =
Square everything inside the parenthesis:
1/(9a^4*b^6) = a^4/9b^6.
NOTE: Never leave neg. exponents in your answer. To remove the neg. exponent
from 1/a^4, multiply numerator and
denominator by a^4:
1/a^4 = 1*a^4/a^4*a^4 = a^4/1 = a^4.
We,actually, moved a^2 to the numerator
and changed the sign. 
Correction: We,actually, moved a^4 to
the numerator and changed the sign of the exponent.