Question

(x)(f''(x))+(11)(f(x))=12x^2. What is f(x)? (x)(f''(x))+(11)(f(x))=12x^2. What is f(x)? @Mathematics

Answer 1

To confirm, the equation is:
\[ x f'' + 11 f = 12x^2 \]

with the second derivative, not the first.

If so use the method of undetermined coefficients. If not, and it's the first derivative, I'd use an integrating factor.

Answer 2

Thanks! This helps!