Question

3(x+7)=18 find the value of x

Answer 1

Answer:

3x+ 21 = 18

3x = -21 + 18

3x = -3

x = -3/3

x = -1

Answer 2

Given :

• 3(x+7)=18

To find :

• the value of x

Solution :

$\implies3(x+7)=18$

$\implies3x+21=18$

$\implies3x = 18 - 21$

$\implies3x = - 3$

$\implies \: x = \dfrac{ - 3}{3}$

$\implies \: x = \dfrac{ - 1}{1}$

$\implies \: x = - 1$

Answer : -1

______________________

Verification of answer :-

To verify our answer , we will put x = -1 in 3(x+7)=18. If RHS = LHS then our answer is correct.

$\implies RHS = 3(x + 7)$

put x = -1

$\implies RHS = 3( - 1 + 7)$

$\implies RHS = 3( 7 - 1)$

$\implies RHS = 3 \times 6$

$\implies RHS = 18$

LHS = 18

Therefore RHS = LHS.

Hence verified

_________________________