Answer:
option (3m-3)(3m-3)
Explanation:
Given in the question an expression,
9m² - 18m + 9
Step 1
divide by 9
9(m² - 2m + 1)
Step 2
factors
-1 x -1 = 1
(-1) + (-1) = -2
Step 3
m² -1m -1m + 1
m(m-1) -1(m-1)
9(m-1)(m-1)
9(m -1)²
(3m-3)(3m-3)
(3m-3)²
3²(m-1)²
9(m-1)²