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kath_the_great4
- Junior | Next Rank: 30 Posts
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- Joined: Mon May 19, 2008 3:48 pm
a^4-b^4 = ( a^2-b^2 ) x ( a^2+b^2 )kath_the_great4 wrote:what is the value of a^4-b^4?
1) a^2-b^2=16
2)a+b=8
So,
1) INSUF
2) INSUF
1+2)
a^2-b^2 = 16
(a+b) x ( a-b) = 16 We know that a+b = 8 so a-b=2 and (a,b) = (5,3)
since we know a&b we can answer the question
C
