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A^4-B^4

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Source: — Data Sufficiency |
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Re: A^4-B^4

by iamcste » Mon May 18, 2009 10:36 am
criszerriny wrote:What is the value of A^4-B^4?

1. A^2-B^2=16
2. A+B=8

C


1. (a-b)(a+b)=16


some may try (A^2-B^2)^2 but that would fetch a term (2A^2*B^2) which we dont know

Insuff

2. A+B ..again we cannot get A^4-B^4


Together, a+b=8, a-b=2

solve to get a and b, and get A^4-B^4
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