Simplifying Powers and Parentheses: (27-3y6)1/3 Solution

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The discussion focuses on simplifying the expression (27-3y6)1/3. Participants agree that the expression can be rewritten as (1/273y6)1/3, emphasizing the importance of evaluating (1/273). They reference exponent rules, particularly how to distribute exponents across terms. The final result simplifies to y^2/27, confirming the correct approach to the problem. Overall, the conversation highlights key exponent rules for simplifying complex expressions.
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Homework Statement


(27-3y6)1/3


The Attempt at a Solution


I THINK THIS IS HOW YOU SHOULD DO THIS:
(1/273Y6)1/3

My feeling is the (1/273) should still be evaluated. Yes?
 
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Remember that ## (a^{x})^{y} = a^{xy} ## and ## a^{-x}=\frac{1}{a^x} ##

How does this help you?
 
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Distribute the exponent

$$(x^a \! y^b)^c=x^{a c} \! y^{b c} \\
(5^8 \! s^4)^{(1/4)}=5^{8 (1/4)} \! s^{4 (1/4)}=5^2 \! s$$
 
solution

ok.
I get y2/27
 
datafiend said:
ok.
I get y2/27

You got it.
 
The working out suggests first equating ## \sqrt{i} = x + iy ## and suggests that squaring and equating real and imaginary parts of both sides results in ## \sqrt{i} = \pm (1+i)/ \sqrt{2} ## Squaring both sides results in: $$ i = (x + iy)^2 $$ $$ i = x^2 + 2ixy -y^2 $$ equating real parts gives $$ x^2 - y^2 = 0 $$ $$ (x+y)(x-y) = 0 $$ $$ x = \pm y $$ equating imaginary parts gives: $$ i = 2ixy $$ $$ 2xy = 1 $$ I'm not really sure how to proceed from here.
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