Help understanding multiplying (4y + 3x +6) (7y + 3x -4)  TOPIC_SOLVED

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Help understanding multiplying (4y + 3x +6) (7y + 3x -4)

Postby willispd on Sun Jan 25, 2009 10:09 pm

Can you hep multiple this problem?

(4y + 3x +6) (7y + 3x -4)
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Postby stapel_eliz on Sun Jan 25, 2009 10:27 pm

willispd wrote:Can you hep multiple this problem?

(4y + 3x +6) (7y + 3x -4)

Have you learned how to multiply polynomials vertically? Try using that method for this. You'd set it up like this:

4y + 3x + 6
7y + 3x - 4
-----------

Here is a similar exercise using the same set-up and solution method:

Code: Select all
                      2x - 3y + 5
                       x + 2y - 3
---------------------------------
                  - 6x +  9y - 15  <= -3 times the first polynomial
       4xy - 6y^2      + 10y       <= 2y times the first polynomial
2x^2 - 3xy        + 5x             <= x times the first polynomial
---------------------------------
2x^2 +  xy - 6y^2 -  x + 19y - 15  <= adding down the "like terms" columns

If you get stuck on the posted exercise, please reply showing your steps and reasoning so far. Thank you! :D

Eliz.
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