Radical 2 is a number, it does not have a coefficient.
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There is the Index, the coefficient and the Radican
6 radical 2
2 radical 11 the square root of 44. 44/2 = 22 radical 2 x 22 radical 2 x 2 x 11 Since 2 is under the radical twice you can take it out 2 radical 11
2X 2 is the coefficient
(a-2(ab)1/2+b)/(a-b)