### 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.**Homework Help ✎*x*^{2}+ 7*x −*8 = 0(

*x*+ 2)^{2}= 495

*x*^{2}−*x −*7 = 0*x*^{2}+ 4*x*= −1

Note the expression in this equation can be factored.

Notice that 49 is a perfect square.

Note the expression in this equation cannot be factored.

Adding 4 to both sides will create a perfect square.