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July 22, 2014

July 22, 2014

Posted by **Ami** on Sunday, May 30, 2010 at 5:45pm.

a) 2y - 3r

b) 3r + 2y

c) 3r - 2x

d) 3r - 2y

- algebra -
**MathMate**, Sunday, May 30, 2010 at 7:15pmArrange the polynomial in decreasing power of r:

18r^2 + 12ry - 3xr - 2xy

=18r² + (12y-3x)r -2xy

Do a mental long division,

The first term is:

18r²/(6r) = 3r

The last term is:

-2xy/(-x) = 2y

Therefore the answer is 3r+2y.

Check:

(6r-x)(3r+2y)

=18r² + (12y-3x)r -2xy

The other factor is correct.

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