Chapter 3: Q10. (page 150)

If $x = - 2$ , then $15 - 3 (x + 1) =$ ?
$(A) 6 (B) 12 (C) 18 (D) 21$

Short Answer

Expert verified

The option $(C)$ is correct, the other options are incorrect, because the value of the expression $15 - 3 (x + 1)$ when $x = - 2$ is 18.

Step by step solution

– Use the substitution method to find the value of the given expression.

Substitute $x = - 2$ in $15 - 3 (x + 1)$ :

$\begin{matrix} 15 鈭� 3 (x + 1) = 15 鈭� 3 (鈭� 2 + 1) substitute 鈭� 2 for x \\ = 15 鈭� 3 (鈭� 1) 鈥夆赌夆赌夆赌夆赌夆赌夆赌夆赌夆赌塻颈尘辫濒颈蹿测 \\ = 15 + 3 \\ = 18 \end{matrix}$

So, $15 - 3 (x + 1) = 18$ when $x = - 2$ .

– Check whether the option Ais correct or incorrect.

Here, in the option $(A)$ it is given that, 6.

The result in step 1 is $15 - 3 (x + 1) = 18$ .

So, option $(A)$ is incorrect.

– Check whether the option Bis true or false.

Here, in the option $(B)$ it is given that 12.

The result in step 1 is $15 - 3 (x + 1) = 18$ .

So, option $(B)$ is incorrect.

– Check whether the option Cis true or false.

Here, in the option $(C)$ it is given that 18.

The result in step 1 is $15 - 3 (x + 1) = 18$ .

So, option $(C)$ is correct.

– Check whether the option Dis true or false.

Here, in the option $(D)$ it is given that 21.

The result in step 1 is $15 - 3 (x + 1) = 18$ .

So, option $(D)$ is incorrect.

Hence, the option $(C)$ is correct, the other options are incorrect, because the value of the expression $15 - 3 (x + 1)$ when $x = - 2$ is $18$ .

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.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

91影视

If $x = - 2$ , then $15 - 3 (x + 1) =$ ?
$(A) 6 (B) 12 (C) 18 (D) 21$

Short Answer

Step by step solution

– Use the substitution method to find the value of the given expression.

– Check whether the option Ais correct or incorrect.

– Check whether the option Bis true or false.

– Check whether the option Cis true or false.

– Check whether the option Dis true or false.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Mechanics Maths

Applied Mathematics

Pure Maths

Geometry

Calculus

Logic and Functions

Study anywhere. Anytime. Across all devices.

91影视

If x=-2, then 15-3x+1=?A6B12C18D21

Short Answer

Step by step solution

– Use the substitution method to find the value of the given expression.

– Check whether the option Ais correct or incorrect.

– Check whether the option Bis true or false.

– Check whether the option Cis true or false.

– Check whether the option Dis true or false.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Mechanics Maths

Applied Mathematics

Pure Maths

Geometry

Calculus

Logic and Functions

Study anywhere. Anytime. Across all devices.

If $x = - 2$ , then $15 - 3 (x + 1) =$ ?
$(A) 6 (B) 12 (C) 18 (D) 21$