Question

we can check the solution by ----------the value of unknown in given equation.​

Answer 1

SOLUTION

TO FILL IN THE BLANK

We can check the solution by _____ the value of unknown in given equation.

EVALUATION

We can check the solution by replacing the value of unknown in given equation.

VALIDATION OF ANSWER

We consider the equation

$\sf{2x + 4 = 9 + x} \: \: \: .....(1)$

We first solve it

$\sf{2x + 4 = 9 + x}$

$\sf{ \implies \: 2x - x = 9 - 4}$

$\sf{ \implies \: x = 5}$

So the required solution is x = 5

Verification :

We now verify the answer

We now check the solution by replacing the value of unknown in given equation

Put x = 5 in LHS of Equation (1)

LHS

$\sf{ = 2x + 4}$

$\sf{ =( 2 \times 5) + 4}$

$= 10 + 4$

$= 14$

RHS

$\sf{ = 9 + x}$

$= 9 + 5$

$= 14$

∴ LHS = RHS

Hence verified

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