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OpenStudy (anonymous):
Is the following problem simplified correctly? (4x+5)(10x+1)=40x2+4x+15x+5 =40x2+19x+20
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jimthompson5910 (jim_thompson5910):
no because you made the mistake in saying 5*10x = 15x
jimthompson5910 (jim_thompson5910):
it should be 5*10x = 50x
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