If using the method of completing the square to solve the quadratic equation x2 + 8x + 11 = 0, which number would have to be added to "complete the
square"?

Add up all the sides

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.