How do you factor #6x^2 +5xy -21y^2#?
(2x - 3y)(3x + 7y)
Use the new AC Method (Socratic Search)
Consider x as a variable, y as a constant, and factor f(x).
p' and q' have opposite signs because ac < 0.
Factor pairs of
Back to f(x) -->
Factored form :