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If `f(x)=(4x+3)/(6x-4), x !=2/3,`show that `fof(x)=x`for all `x!=2/3dot`What is the inverse of `f?` |
Answer» `f(x) = ( 4x + 3)/( 6x - 4), x ne (2)/(3)` `therefore (fof)(x) = f{f(x)} = f((4x = 3)/(6x -4))` `" " = (4(( 4x = 3)/(6x - 4))+ 3)/(6((4x + 3)/(6x - 4))- 4)` `" " = ( 16x + 12 + 18x - 12 ) /( 24x + 18 - 24x +16) = ( 34x )/(34) = x` `therefore (fof) (x) = x` `rArr (fof) = 1 ` `rArr f = f^(-1)` Therefore, inverse of `f` is `f^(-1) = f` |
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