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2x² - 7x + 3
a + b = 7
ab = 2 × 3 = 6
1 , 6
2 , 3
1 + 6 = 7
2 + 3 = 5
a = 1
b = 6
( 2x² + x ) + ( 6x + 3 )
x ( 2x + 1 ) + 3 ( 2x + 1 )
( 2x + 1 ) ( x + 3 )
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