SOLUTION: simplify the following expression (3 - 2√7)(3 + 2√7)

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Question 313140: simplify the following expression
(3 - 2√7)(3 + 2√7)
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
Do FOIL.
(3-2sqrt7)(3+2sqrt7)
=9 -4(sqrt7)(sqrt7))
=9-4(7)
=9-28
=-19