posted by Sarah .
Find f. (Use C for the constant of the first antiderivative and D for the constant of the second antiderivative.)
f ''(x) = 8 + x3 + x5
if f ''(x) = 8 + x^3 + x^5 , notice how we write exponents
then f' (x) = 8x +(1/4)x^4 + (1/6)x^6 + C
f(x) = 4x^2 + (1/20)x^5 + (1/42)x^7 + Cx + D