Answer:

Step-by-step explanation:
Given:

To find:

We can find g(d) by substituting x in g(x) with d, so we'll have;

We can find f(d) by substituting x in f(x) with d, so we'll have;

We can now go ahead and subtract f(d) from g(d) and simplify as seen below;

Therefore, g(d) - f(d) = -d^2 - d -2