Question

solve (D^2+16)y = x^4 + e^3x + cos3x

Answer 1

${(D}^{2}+16)y$ =${x}^{4}+{e}^{3x}+cos3x$

${(yD}^{2}+16y)$ =${x}^{4}+{e}^{3x}+cos3x$