9
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9b2 , if you mean 9b^(2) then the coefficient is the large prefix number, in this case '9'.
Radical 2 is a number, it does not have a coefficient.
2X 2 is the coefficient
8b^2 -9b +1 8b^2 -8b -b +1 8b(b-1) - 1(b-1) (8b-1)(b-1)
2a + 3 - 9b - a - 7 Bring like terms together: = 2a - a - 9b + 3 - 7 Combine like terms: = a - 9b - 4