Chapter 9: Q.119 (page 898)

In the following exercises, solve by using the Quadratic Formula: $r^{2} - 8 r = 33$

Short Answer

Expert verified

The solution of the quadratic equation is and $r = 11; r = - 3$

Step by step solution

Given information

We are given a quadratic equation $r^{2} - 8 r = 33$

Add -33 on both sides and then identify the values of a,b,c

On adding $- 33$ on both sides we get

$r^{2} + 8 r - 33 = 0$

On comparing with standard equation we get, $a = 1, b = 8, c = - 33$

Write the quadratic formula and substitute the values in it

The quadratic formula can be given as

$r = \frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$

On substituting the values we get

$r = \frac{- 8 \pm \sqrt{64 - 4 (1) (- 33)}}{2 (1)}$

Simplify

On simplifying we get

$r = \frac{8 \pm \sqrt{64 + 132}}{2} r = \frac{8 \pm \sqrt{196}}{2} r = \frac{8 \pm 14}{2}$

On further simplifying we get

$r = \frac{8 + 14}{2} r = \frac{22}{2} r = 11$ and $r = \frac{8 - 14}{2} r = \frac{- 6}{2} r = - 3$

Conclusion

The solution of the quadratic equation is $r = - 3$ and $r = 11$

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In the following exercises, solve by using the Quadratic Formula: $r^{2} - 8 r = 33$

Short Answer

Step by step solution

Given information

Add -33 on both sides and then identify the values of a,b,c

Write the quadratic formula and substitute the values in it

Simplify

Conclusion

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In the following exercises, solve by using the Quadratic Formula:r2-8r=33

Short Answer

Step by step solution

Given information

Add -33 on both sides and then identify the values of a,b,c

Write the quadratic formula and substitute the values in it

Simplify

Conclusion

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Statistics

Calculus

Theoretical and Mathematical Physics

Discrete Mathematics

Geometry

Logic and Functions

Study anywhere. Anytime. Across all devices.

In the following exercises, solve by using the Quadratic Formula: $r^{2} - 8 r = 33$