SOLUTION: (3 - 2 sqrt 7) * (3 + 2 sqrt 7)

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Question 200784: (3 - 2 sqrt 7) * (3 + 2 sqrt 7)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
:49): (3 - 2 sqrt 7) * (3 + 2 sqrt 7)
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Since (a-b)(a+b) = a^2 - b^2 you get:
= 3^2 - (2sqrt(7))^2
= 9 - 28
= -19
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Cheers,
Stan H.