Final answer:
The general solution of the related homogeneous differential equation is yh(x) = C₁ y₁ + C₂ y₂.
Step-by-step explanation:
The general solution of the related homogeneous differential equation y ′′+16y=0 is the function yh(x) = C₁ y₁ (x) + C₂ y₂ (x) = C₁ y₁ + C₂ y₂.