solve 4x^2-2xy+3y^2=2 for x in terms of y  TOPIC_SOLVED

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solve 4x^2-2xy+3y^2=2 for x in terms of y

Postby Mumina on Sat Sep 05, 2009 12:47 pm

This is the beginning of our algebra course and I am already lost! This seems so simple, solve for x in terms of y:

4x^2-2xy+3y^2=2

I can't figure out how to isolate x on one side. The y keeps popping up! Help please!
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Postby stapel_eliz on Sat Sep 05, 2009 1:43 pm

Mumina wrote:...solve for x in terms of y: 4x^2-2xy+3y^2=2

The trick here is to view this as a quadratic in y:

. . . . .3y2 - 2xy + 4x2 = 2

You can apply the Quadratic Formula to the equation, with a = 3, b = -2x, and c = 4x2.

. . . . .

...and so forth.

You will get "y=" two different things, one from the "plus" and the other from the "minus" of the "plus / minus" in the Formula. :wink:
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