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√3 x √21 = √3 x √(3 x 7) = (√3 x √3) x √7) = 3√7
-6*sqrt(7) cannot be simplified. Its value is -15.8745, approx.
Well, darling, 5 radical 7 is simply 5√7. It's like saying "5 times the square root of 7." So, there you have it, sweetie, nothing too crazy or radical about it. Just a little math fun to keep you on your toes!
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