Question 277002
2c^2-5cd-42d^2
2*-42=-84; two factors of -84 who's sum is -5= -12, +7
2c^2-12cd+7cd-42d^2
2c(c-6d)+7d(c-6d) factoring by grouping.
(2c+7d)((c-6d)
.
Ed