21b^3 - 7b^2 + 12b - 4 = 21b^3 - 7b^2 + 12b - 4
= 7b^2(3b - 1) + 4(3b - 1)
= (3b - 1)(7b^2 + 4)
Content will be erased after question is completed.
Enter the email address associated with your account, and we will email you a link to reset your password.
Forgot your password?