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#1

$Old$ November 16th, 2009, 12:34 AM

birky $birky is offline$

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$Default$ factorising polynomials

Hi does anyone know how to factorise 80 - (5k)^2

thanks in advance.

Last edited by mr fantastic; November 16th, 2009 at 03:45 AM.

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$Old$ November 16th, 2009, 03:46 AM

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Hi does anyone know how to factorise 80 - (5k)^2

thanks in advance.

You have $(\sqrt{80})^2 - (5k)^2$ so use the Difference of Two Squares formula $A^2 - B^2 = (A - B)(A + B)$ .

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$Old$ November 16th, 2009, 04:13 AM

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$80-(5k)^{2}=80-25k^{2}=-5(5k^2-16)$

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