x + 4
x2 + 5x - 120 can not be factored.
x2 + 8x + 15 = (x + 3) (x + 5).
(x2 plus 40) (x minus 1)
x2 + 9 + 20 = x2 + 29, and can not be factored.I assume though that you mis-wrote your question, and what you in fact want to ask is how to factor x2 + 9x + 20.In that case, the answer is (x + 4)(x + 5).
x3 + x2 + 4x + 4 = (x2 + 4)(x + 1)
x + 4
x2(x3 + 1) is the best you can do there.
Factor x2 plus 12xp plus 36p2 is (x+6p)(x+6p).
You can't factor it
That does not factor neatly.
Not factorable
1
x2+10x-336
x2 + 5x - 120 can not be factored.
x2 - 13 + 30 = x2 + 17, which has no real factors.
x2 + 26x + 48 = (x + 24)(x + 2)