Step 1 :Given that \(\lim _{x \rightarrow-1} f(x)=5\) and \(\lim _{x \rightarrow-1} g(x)=8\)
Step 2 :We need to find the limit of \((f(x))^3 + g(x)\) as x approaches -1
Step 3 :The limit of a sum is the sum of the limits, so we can find the limit of each part separately and then add them together
Step 4 :The limit of \((f(x))^3\) as x approaches -1 is \((\lim_{x \rightarrow -1} f(x))^3 = 5^3 = 125\)
Step 5 :The limit of \(g(x)\) as x approaches -1 is \(\lim_{x \rightarrow -1} g(x) = 8\)
Step 6 :So the limit of the whole expression is \(125 + 8 = 133\)
Step 7 :Final Answer: The limit of \((f(x))^3 + g(x)\) as \(x\) approaches -1 is \(\boxed{133}\)