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2x.3= 6x
1.x= 1x/x
1.3= 3
jadi, 2xkuadrat+6x+x+3= 2xkuadrat+7x+3
maaf kalo jawabannya salah :)
= ( 2x × x)+(2x × 3) + (1 × x )+ ( 1× 3)
= 2x² + 6x + x + 3
= 2x² + 7x + 3