Answer
3m
Work Step by Step
Given the polynomial
$9m^{3}$ + $15m^{2}$ - 21m
We find the factors of all the terms in the polynomial.
Factors of 9: 1,3,9
$1 \times 9 ; 3 \times 3$
Factors of 15: 1 ,3, 5, 15
$1 \times 15 ; 3 \times 5$
Factors of 4: 1, 3, 7, 21
$1 \times 21 ; 3 \times 7$
All the three terms have the factor of 3m and thus the greatest common factor is 3m.
