CAROLYN H. answered • 10/10/16
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I believe you meant (√5 - √7)2 = (√5 - √7) (√5 - √7) = 5 - √35 - √35 + 7 Using foil = 12 - 2√35.
CAROLYN H.
It is 5+7 not 5-7. Foil last step is (-√7)(-√7) = +7
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10/10/16
Jimmy J.
10/10/16