Question

find the missing value. (9x^(2)-4)(divide)(3x+1)=3x+( )-(3)/(3x+1)

Answer 1

After you find the first quotient term, 3x, the dividend for the next stage of long division is
  9x² - 4 - 3x(3x+1) = -3x -4
Then the next quotient term is (-3x)/(3x) = -1.

The missing value is -1.