Answer in decimal form = -26.25
Answer as an improper fraction = -105/4
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Work Shown:
1/2 = 0.5
Replace every copy of x with 0.5 in the f(x) function.
f(x) = x-8
f(0.5) = 0.5-8
f(0.5) = -7.5
Repeat the same idea for the g(x) function
g(x) = x+3
g(0.5) = 0.5+3
g(0.5) = 3.5
Then multiply the results
f(0.5)*g(0.5) = (-7.5)*(3.5) = -26.25
Then optionally convert to an improper fraction following the steps shown below.
-26.25 = -(26.25)
-26.25 = -(26+0.25)
-26.25 = -(26+1/4)
-26.25 = -(26*(4/4)+1/4)
-26.25 = -(104/4+1/4)
-26.25 = -105/4