Help with exponents!  TOPIC_SOLVED

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Help with exponents!

Postby partap95 on Wed Oct 09, 2013 3:42 pm

an=b
a=b1/n

But,
-12 = 1
-1 = 11/2
-1 = 1

Please help.
Can I use this formula to solve questions on exponents
partap95
 
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Re: Help with exponents!  TOPIC_SOLVED

Postby FWT on Thu Oct 10, 2013 11:21 am

partap95 wrote:an=b
a=b1/n

If you look close, the book probably says something about a&b being positive or at least non-neg.

partap95 wrote:But,
-12 = 1
-1 = 11/2
-1 = 1

As soon as you start putting negs inside square roots the rules change. Because otherwise you'd get wrong answers like you showed here. The technical rule for square roots of squares is absolute value, so your second line should really be sqrt[(-1)^2] = sqrt[1] which means your last line should be |-1| = sqrt[1] so 1 = 1.
FWT
 
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