Answer:
It's C.7
Step-by-step explanation:
Use the foil method
x₁ = 0
x₂ = 6
9x² - 54x = 0
9x(x - 6) = 0
x(x - 6) = 0
x = 0
x - 6 = 0 → x = 6
Hope this helps! :)