Find the product of all constants t such that the quadratic x^2 + tx - 15 can be factored in the form (x + a)(x + b), where a and b are integers.
Factors of -15 = a , b
a b
-1 15 t = 14
-15 1 t = -14
-3 5 t = -2
5 - 3 t = 2
