Find the slope: plz help I know I know but plz really this one was hard for me

The parabola opens: y=√x-4 (principal square root) up down right left

The first few steps in solving the quadratic equation 9x2 + 49x = 22 ? 5x by completing the square are shown. 9x2 + 49x = 22 ? 5x 9x2 + 54x = 22 9(x2 + 6x) = 22 which is the best step to do next to solve the equation by completing the square? 9(x2 + 6x + 3) = 25 9(x2 + 6x + 3) = 49 9(x2 + 6x + 9) = 31 9(x2 + 6x + 9) = 103

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.