Solve the equation by making an appropriate substitution. x Superscript 4 Baseline minus 34 x squared plus 225 equals 0 Question content area bottom Part 1 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The solution set is StartSet nothing EndSet . (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) B. The solution set is empty set