exponents

lillyiggie

New member
Joined
Oct 2, 2005
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2
Having trouble with these exponent problems.

(2a^-2b^5 over 4a^2b^7 )^-2 Help
 

Denis

Senior Member
Joined
Feb 17, 2004
Messages
1,495
lillyiggie said:
Having trouble with these exponent problems.
(2a^-2b^5 over 4a^2b^7 )^-2 Help
Remember that: n^(-p) = 1 / n^p and (n^p)^k = n^(pk)

[(2 a^-2 b^5) / (4 a^2 b^7 )]^-2

= (1 / (2 a^4 b^2))^-2

= 1/ [(1 / (2 a^4 b^2))^2]

= (2 a^4 b^2)^2

= 4 a^8 b^4

If not clear, see your teacher...or perhaps someone else will make it clearer...
 
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