1) If f (x) = 3 - 2x , calculate the value of f -1 (5) . 2) If x ^2 + y ^2 = 25 and x ^2 - y ^2 = 7 then x ^4 - y ^4 equals?
Last edited by mr fantastic; October 28th 2009 at 03:50 AM. Reason: Changed post title.
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Originally Posted by sri340 1) If f (x) = 3 - 2x , calculate the value of f -1 (5) . 2) If x ^2 + y ^2 = 25 and x ^2 - y ^2 = 7 then x ^4 - y ^4 equals? 1) f (x) = 3 - 2x = y(say) to find put x= 5 in above equation 2) If x ^2 + y ^2 = 25 and x ^2 - y ^2 = 7 then x ^4 - y ^4 equals? 2) use (because
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