Does anyone have any ideas for the factors of this equation? $\displaystyle 4x^2-75xy-100y^2$ Thanks for your help!
Last edited by AShaw; Sep 4th 2008 at 11:36 AM. Reason: added thanks!
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Hello, Originally Posted by AShaw Does anyone have any ideas for the factors of this equation? $\displaystyle 4x^2-75xy-100y^2$ Thanks for your help! Write (2x)˛-75xy-(10y)˛ Then, complete the square . (Completing the Square: Solving Quadratic Equations)
$\displaystyle (4x+5y)(x-20y)$
Originally Posted by AShaw Does anyone have any ideas for the factors of this equation? $\displaystyle 4x^2-75xy-100y^2$ Thanks for your help! $\displaystyle =4x^2-75xy-100y^2$ $\displaystyle =4x^2-80xy+5xy-100y^2$ $\displaystyle =4x(x-20y)+5y(x-20y)$ $\displaystyle =(4x+5y)(x-20y)$
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