Three polynomials are factored below, but some coefficients and constants are missing. All of the missing values of a,b,c, and d are integers.
1. x2 -8x+15= (ax+b) (cx+d)
2. 2x2-8x2-24x = 2x (ax+b) (cx+d)
3. 6x2+14x+4 = (ax+b) (cx+d)