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2x2 + 7x + 3
= 2x2 + (6+ 1)x +3
2x2 + 6x + x + 3 =
= 2x(x + 3) +1(x+3)
= (2x + 1)(x+3)
either 2x +1= 0
= > x = -1 2
or x +3 = 0
=> x= = -3
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