How do you factor #3x^2 + 5x - 28#?
2 Answers
Apr 21, 2016
Explanation:
Apr 21, 2016
(3x - 7)(x + 4)
Explanation:
Use the new AC method to factor trinomials (Socratic Search)
p' and q' have opposite signs, because ac < 0.
Factor pairs of (ac = -84) -->...(-4, 21)(-7, 12). This sum is 5 = b. Then, p' = -7 and q' = 12.
Back to y,
Factored form: