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Chapter 1: Q18. (page 24)

If $4 x + 7 = 18$ , what is the value of $12 x + 21$ ?
A. $2.75$
B. 32
C. 33
D. 54

Short Answer

Expert verified

The correct option is 54.

Step by step solution

01

Step 1- Observe the provided equation

The expression is three times of the left side of the equation.

02

– Determine the required value

Perform multiplication of 3 on both sides of the provided equation.

$\begin{matrix} 3 (4 x + 7) = 3 \cdot 18 \\ 12 x + 21 = 54 \end{matrix}$

03

Step 3- Make the conclusion

As the provided expression is equivalent to the number 54 so it is the correct option.

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