-129 is the anwser to ur problem
Do you mean an extraneous solution? I will tell you what I think. To tell if a solution is extraneous you need to go back to the original problem and check if there actually is a solution or if the solution is actually right. If not then it is extraneous.
Answer:
x=-5
Step-by-step explanation:

8ft is the dstance between them.
5+3 = 8