SOLUTION: Simplify ( sqrt of 7 + 4)(sqrt of 7 - 4)

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Question 49830: Simplify ( sqrt of 7 + 4)(sqrt of 7 - 4)
Answer by mathchemprofessor(65) About Me  (Show Source):
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Simplify ( sqrt of 7 + 4)(sqrt of 7 - 4)
=(7^1/2 +4)(7^1/2 -4)=(7^1/2)^2-4^2=7-4^2=7-16=-9