Problem 386 (difficulty: 2/10)

Show that the following functions are injective on the given set \(\displaystyle H\), and calculate the inverse.

 (1)  \(\displaystyle f(x)=3x-7, \ H=\R\);     (2)  \(\displaystyle f(x)=x^{2}+3x-6, \ H=[-3/2,\infty)\).

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