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jawab


fog(x) = { 3(x + 1) + 1 }/ {4(x +1) - 5 }
fog(x) = (3x + 4) /(4x - 1)
(fog)⁻¹  {( 3x+4) / (4x -1)} = x

3x + 4 / (4x -  1) = 1
3x  + 4 = 4x - 1
-x = - 1 - 4
x = 5
(fog)⁻¹ (1)  = 5