How do you factor #x^3 + 3x^2 + 7x + 21#?
1 Answer
May 12, 2015
Try small numbers: 1, 2, 3, -3...
f(-3) = - 27 + 27 - 21 + 21 = 0, then (x + 3) is a factor.
Check: Develop
Try small numbers: 1, 2, 3, -3...
f(-3) = - 27 + 27 - 21 + 21 = 0, then (x + 3) is a factor.
Check: Develop