Question

if 3x=21,what is the value of (4X +1)?​

Answer 1

3x=21

x=21/3

x=7

(4x+1)

4(7)+1

28+1

29

Answer 2

$\blacklozenge\:{\large{\underline{\underbrace{\rm{Solution:}}}}}$

$\rm{:\implies 3x = 21}$

$\rm{:\implies x = \dfrac{21}{3}}$

$\rm{:\implies x = 7}$

$\rm{Substitute\:x=7\:in\:4x+1:}$

$\rm{:\implies 4x+1}$

$\rm{:\implies 4 \times 7+1}$

$\rm{:\implies 28+1}$

$\boxed{\red{\frak{29}}}$

$\blacklozenge\:{\large{\underline{\underbrace{\rm{Concept:}}}}}$

According to the Question, We need to find the value of 4x+1. The great clue given for us is 3x = 21. First, we took the condition of 3x = 21. Here, we found the value of x and at last, we substituted the value of x in 4x+1 to get our answer.