This page randomly generates an exercise and its solution. Click here
to refresh the page and generate a new exercise. Use the [link]
below if you want to return to the same exercise again at a later time. Click here
to go back to the main page with the course information and schedule.
Solve the following equation:
We attempt to use the explicit formula
for computing roots of congruence classes modulo a prime:
Since the formula did not return a valid root, there is no solution; 3 is not a quadratic residue in ℤ/7ℤ