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April 21, 2014

April 21, 2014

Posted by **Bill** on Friday, January 11, 2013 at 11:05am.

- Math -
**Math Teach**, Friday, January 11, 2013 at 12:14pmFoil Left side gives you:

= a^2c^2 + a^2d^2 + b^2c^2 + b^2d^2

= (ac)^2 + (ad)^2 + (bc)^2 + (bd)^2

Foil Right side (ac+bd)^2

= ac x ac + ac x bd + ac x bd + bd x bc

= (ac)^2 + 1acbd + 1acbd + (bd)^2

Foil (ad-bc)^2

= ad x ad - bc x ad - bc x ad + bc x bc

= (ad)^2 - 1acbd - 1acbd + (bc)^2

Combine all terms on right side

left with (ac)^2 + (bd)^2 + (ad)^2 + (bc)^2

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