Grade 11 Factoring Math Help Please?

[Wub to craft]

For what integer values of k can each polynomial be factored? Explain!

a) x(squared) + kx + 4

b) x(squared) + 4x + k

c) x(squared) + kx + k

How do I do it? :s i fucking suck at math, lollllll.

 

[Imagine]

a). 4, 5, -4, -5

(Sum of different factors of four, inc. negs).

b). 3, 4

(Products of different ways to add up to four).

c). 4,

(Ways that 2(x) = x^2);