Question

is root 98 devided by root 2 and is a rational or not
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Answer 1

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98= 49 * 2 = 7^2*2, so neither square root of 98 is rational, it's the product of 7 and the square root of 2, that is not rational. Instead, of course, the Square Root of (98+2) is the Square Root of (100), that is 10, so it's rational.