Question

Help please :)

Simplify 27^-2/3

a) 9
b) 1/9
c) -1/9
d) -9

Answer 1

The "-" means you should invert.
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The "3" means you should take the cube root
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The "2" means you shour square.
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These operations can be done in any order.
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Taking the cube root first you get:
3^-2
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Inverting you get:
(1/3)^2
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Squaring you get:
1/9

Answer 2

remember, \[x^{-\#} \rightarrow \frac{1}{x^{\#}}\]

Answer 3

This is another method for your reference...