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Foil 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 =
