Simplify $\sqrt{36x^2 - 108x+81}$.

6x - 9 2x - 9 5x - 9 3x - 9

6x - 9

$\sqrt{36x^2 - 108x+81}$ Put x = 1  $\sqrt{36 × 1^2 - 108 × 1+81}$ = -3 Now match from the options by putting the value of x. 6x - 9 = 6×1 - 9 = -3 satisfied.