Question 204890
Please help me simplify this expression.
(3-2√7) (3+2√7) 
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Since the form is (a-b)(a+b) which has a product of a^2-b^2,
you have (3^1 - (2sqrt(7))^2) = 9 - 4*7 = 9-28 = -19
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Cheers,
Stan H.
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