### Home > AC > Chapter 8 > Lesson 8.2.5 > Problem8-89

8-89.

Calculate the expressions below. Then compare your answers from (a) and (b) to those in problem 8-88. What do you notice?

1. $\frac { - 6 + \sqrt { 6 ^ { 2 } - ( 4 ) ( 1 ) ( - 40 ) } } { 2 \cdot 1 }$

1. $\frac { - 6 - \sqrt { 6 ^ { 2 } - ( 4 ) ( 1 ) ( - 40 ) } } { 2 \cdot 1 }$

1. $\frac { - 13 - \sqrt { 13 ^ { 2 } - ( 4 ) ( 2 ) ( - 24 ) } } { 2 \cdot 2 }$

1. $\frac { - 13 + \sqrt { 13 ^ { 2 } - ( 4 ) ( 2 ) ( - 24 ) } } { 2 \cdot 2 }$

$\frac{-6+\sqrt{36+160}}{2}$

$\frac{-6+\sqrt{196}}{2}$

$\frac{-6+14}{2}$

$\frac{8}{2}$

$4$

Follow the steps in part (a).

Follow the steps in part (a).

−8

Follow the steps in part (a).

The answers you get for parts (a) through (d) will match those found in problem 8-88.