How do you factor the expression #91-90t-16t^2#?
Factor y = -16t^2 - 90t + 91
I use the new AC Method to factor trinomials (Socratic Search).
p' and q' have opposite signs.
Factor pairs of (-1456) --> ...(-8, 182)(-14, 104). This sum is (- 14 + 104) = 90 = b. Then, p' = -14 and q' = 104.
NOTE. This method is systematic. There are no guessing and no lengthy factoring by grouping.