Question 781579
Each term has a factor of 2.
{{{12x^2-2x-30=2(6x^2-x-15)}}}


Try to find any logical combinations of binomial factors for the quadratic expression.

(2_____)(3_____)
(2_____)(3______)
(2____)(3_______)
(2______)(3____)
(6_____)(1_____)
.
?

There are eight combinations to evaluate, and none of them work.  The quadratic part without the "2" factor is not factorable any further.