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7/23/2013 2:42:10 AM
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3xz+(5x+3z)(7x-2xz+y-4z) [b]3xz[/b] + 35x^2 - 10x^2z + 5xy [b]- 20xz[/b] [b]+ 21xz[/b] - 6xz^2 + 3yz -12z^2 Now we simplify: 35x^2 - 10x^2z + 5xy + 4xz + 3yz - 6xz^2 -12z^2 You get a 4xz because of 3xz - 20xz + 21xz You probably made a simple mistake somewhere. I hope this helps and good luck on your placement test.
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