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okay if you are asking
x^2 + x-30
factoring would be
x( x+1-30)
if you are saying
x2+ x-30
same as
2x+x-30
factored would be
x( 2+1-30)
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).