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.
English
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Yup that's right
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[quote]You probably made a simple mistake somewhere.[/quote] I have a tendency to rush basic arithmetic and whatnot. : / So it's probably a stupid mistake like me looking at an [i]x[/i] and for whatever reason writing down a [i]y[/i].
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Haha, I know the feeling all too well.