[Math4u] Questions ???

Hi everyone, can you help me to solve these proplems:

 

1.If we find the inverse function of: f (x) = 3x+ 5 / 7x + 2  we get f ^ -1(x) = 2x + b / cx + d ,

 

then find  2d - bc .

 

2.If  f (x) = x^2 + 2x + 4, x >= -1, then the graph of f ^ -1 lies completely above the x-axis

 

on the interval.

 

3.The domain of the inverse function of  f (x) = 3x ^2 -12x  is equal to.

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