Find the inverse function for f(x)=square root 2x-6

The roots are-4 and 7y=x² - 3x - 28The roots are
-9 and 2x² = 18 - 7xThe roots are-4,and 2y = x² + 2x -8The roots are-8 and 10x² - 2x - 6 = 74The roots are
-15 and-1x² + 15 = - 16xThe roots are-5 and 9y=x² - 4x - 45The roots are 
4 and 14x² - x + 56 = 17xThe roots are
2 and 27x² - 29x = - 54