x2 + 2x - 48
= x2 + 8x - 6x - 48
= x(x + 8) - 6(x + 8)
= (x - 6)(x + 8)
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x + 4
x2 + 5x - 120 can not be factored.
(x2 plus 40) (x minus 1)
x2 + 8x + 15 = (x + 3) (x + 5).
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).