Look for a common factor, shared between the two parts. Then divide both parts by this factor, to find the other factor.
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Divide all terms by 2 and it can then be factored to (2x+1)(5x+2)
4(2b+5)
Divide all terms by 4:- x2+5x-6 = (x-1)(x+6) when factored
5x2 + 20x = 5x (x + 4)
20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19