SOLUTION: 9.3 94. what is (3 - 2 square root 7)(3 + 2 square root 7)

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Question 170586: 9.3
94. what is (3 - 2 square root 7)(3 + 2 square root 7)
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
3-2sqrt7
3+2sqrt7
-------------------------
9-6sqrt7+6sqrt7-4*7
9-28=-19 ans.