I assume x2 + 5x - 36 is the polynomial in the question. First, look for two factors of 36 that have a difference of 5, which would be 9 and 4. It would factor into (x + 9)(x - 4). To double check, multiplying them together results in x2 - 4x + 9x - 36 = x2 + 5x - 36.
If the polynomial is 5x2 +7x +2
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(x + 2)(x - 9)
-((x + 2)(x - 9))
(x - 3)(x + 6)
(5x + 2)(x + 1)
-70