x2+5x-25
-> What number adds to give 25 and multiplies to give 25?
-> None, this problem cannot be factored; roots must be found using the quadratic formula
x = (-b+/- sqrt (b2-4ac))/2a
x = -5+/- sqrt (52-4(1)(-25))/2(1)
x = -5 - sqrt (125)/2
x = -5 + sqrt (125)/2
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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).