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5x^2 +18x +9 =0
Find two numbers, when you add them they give you 18, and when you multiply the same numbers they give you 45, i.e. 15 and 3
(5x^2 + 15x) + (3x + 9) = 0
Factoring out will give you
5x(x+3) + 3(x+3) = 0
so x=-3/5 or x=-3
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