Follow the steps for graphing a rational function to graph the function Upper R left parenthesis x right parenthesis equals StartFraction x squared plus 13 x plus 40 Over x plus 8 EndFraction . Question content area bottom Part 1 If needed, first write the given function as a single rational expression. Then, factor the numerator and denominator of R(x). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. R(x)equals enter your response here (Type your answer in factored form. Do not simplify.) B. R(x) is already in factored form. Part 2 What is the domain of R(x)? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. StartSet x|x greater than or equals nothing EndSet (Type an integer or a simplified fraction.) B. StartSet x|x not equals nothing EndSet (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) C. StartSet x|x less than nothing EndSet (Type an integer or a simplified fraction.) D. The domain is the set of all real numbers