Question 1035051
Study this lesson: <a href="https://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">https://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev</a>
The use of the formula is shown in the lesson also.



You should find y=1  OR  y=4.