Question 31921
Whoa partner I believe you are way off in left field. Let to talk about so lets get started.

Your first question: Factor completely: x^2-5x-14
Fact: A binomial times a binomial equals a trinomial
Ask yourself what factors of negative 14 equals 5?
Answer: 7, -2
So: x^2+7x-2x-14==>x(x+7)-2(x+7)
The same numbers in the parentheses is one of your quantities the one outside is the other==>(x-2)(x+7)

Your second question follows under the special rule of "the difference of two squares" this occurs when the middle term become zero in multiplying two binomials and the format is: (x-y)(x+y)

Back to your problem:(2x-6y)(2x+6y) is your answer.