Chapter 3: Q55. (page 127)

Multiple choice What is the solution of the equation? $- 3 (- 2 x - 1) = - 21$
A. -4
B. -3
C. 3
D. 4

Short Answer

Expert verified

The correct option is A. $- 4$

Step by step solution

Step-1 – Given

The given equation is: $- 3 (- 2 x - 1) = - 21$

Step-2 – To determine

We have to find x.

Step-3 – Calculation

$- 3 (- 2 x - 1) = - 21$

We first simplify the given equation

$6 x + 3 = - 21$

Subtract 3 from both sides

$6 x + 3 - 3 = - 21 - 3$

$6 x = - 24$

Divide by on both sides

$\frac{6 x}{6} = \frac{- 24}{6}$

$x = - 4$

Therefore, the required value of x is – 4.

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Multiple choice What is the solution of the equation? $- 3 (- 2 x - 1) = - 21$
A. -4
B. -3
C. 3
D. 4

Short Answer

Step by step solution

Step-1 – Given

Step-2 – To determine

Step-3 – Calculation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Geometry

Mechanics Maths

Theoretical and Mathematical Physics

Applied Mathematics

Logic and Functions

Discrete Mathematics

Study anywhere. Anytime. Across all devices.

Multiple choice What is the solution of the equation?−3(-2x−1)=−21A. -4B. -3C. 3D. 4

Short Answer

Step by step solution

Step-1 – Given

Step-2 – To determine

Step-3 – Calculation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Geometry

Mechanics Maths

Theoretical and Mathematical Physics

Applied Mathematics

Logic and Functions

Discrete Mathematics

Study anywhere. Anytime. Across all devices.

Multiple choice What is the solution of the equation? $- 3 (- 2 x - 1) = - 21$
A. -4
B. -3
C. 3
D. 4