Question 827228
<pre><b>
  {{{y=int((9x^2+2x-9),dx)}}}{{{""=""}}}{{{int((9x^2),dx)+int((2x),dx)+int((-9),dx)}}}{{{""=""}}}{{{9int((x^2),dx)+2int((x),dx)-9int(dx)}}}{{{""=""}}}
{{{9(x^3/3)+2(x^2/2)-9x+C}}}{{{""=""}}}{{{3x^3+x^2-9x+C}}}

  y = 3x³+x²-9x+C

Substitute (x,y) = (3,8)

  8 = 3(3)³+(3)²-9(3)+C
  8 = 3(27)+9-27+C
  8 = 81+9-27+C
  8 = 63+C
-55 = C

Edwin</pre>