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 + 2x - 15 = (ax + b)(cx + d)
2.2r? + 6x2 - 20x = 2x(ax + b)(x + d)
3.9x2 + 21x + 6 = (ax + b)(cx + d)
Fill in the table with the missing values of a, b, c, and d.
b
d
a
с
1. 1
-3
2.1
3.
6