posted by Tom .
Using an upper-case "C" for any arbitrary constants, find the general indefinite integral
∫ (-2-t)(-9-t^2) dt
Now I multiplied both parentheses to get:
∫ (18 + 2t^2 + 9t + t^3) dt
now I integrated and got:
18t + 2t^3/3 + 9t^2/2 + t^4/4 + C
but I'm told this answer is incorrect.
What am I doing wrong?