Trinomials Where A=1

• When factoring trinomials that are equal to 1, you can use Reverse FOIL and c>0 and Reverse FOIL and c<0.
  • Reverse FOIL and c>0
    • To reverse FOIL, find two numbers whose product is c and sum is b. If c is positive, the signs in the two binomials have to stay the same.
      • Example:x2+10x+24
        • Find Factors of 24: 6*4, 2*12, 24*1, 8*3
        • Factor: (x+6)(x+4)
  • Reverse FOIL and c<0
    • To reverse FOIL here, find two numbers whose product is c and sum is b. If the c is negative, the binomial signs have to be different.
      • Example: x2+x-6
        • Find factors of -6: -3*2, 3*-2, -6*1, 6*-1
        • Factor: (x+3)(x-2)