### Home > A2C > Chapter 6 > Lesson 6.2.2 > Problem 6-76

6-76.

Although the quadratic formula always works as a **strategy** to solve quadratic equations, for many problems it is not the most efficient method. Sometimes it is faster to factor or complete the square or even just “out-think” the problem. For each equation below, choose the method you think is most efficient to solve the equation and explain your reason. **Note that you do ****not**** actually need to solve the equation.**

Note the expression in this equation can be factored.

Notice that

is a perfect square.

Note the expression in this equation cannot be factored.

Adding

to both sides will create a perfect square.