An assignment contains 5 multiple-choice questions (choices A-D). You guess on every question. What is the probability you answered all 5 questions correctly?

So there's a 25% in each question, then a 5% chance in 5 questions.

100/4=25

25/5=5

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square