SOLUTION: 3 radical 28 minus 2 radical 63

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Question 980817: 3 radical 28 minus 2 radical 63
Answer by Boreal(15235) About Me  (Show Source):
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sqrt(28)=2 sqrt (7) ;;;sqrt 4 * sqrt 7
sqrt (63)=3 sqrt (7);;sqrt(9)*sqrt (7)
3*2 sqrt(7)-2*3sqrt(7)=0