Which of the following values of ‘ $n$ ’ is a solution to the equation $2 n - 4 = 4$ ?

3

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- 4

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2

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4

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Solution

The correct option is D $4$
Using Trial and Error method:
(a) Substituting $n = 2$ we get,
$2 (2) - 4 = 0 \neq 4$ ,
So, LHS is not equal to RHS.

(b) Substituting $n = 4$ we get,
$2 (4) - 4 = 4$
Hence, LHS is equal to RHS.

(c) Substituting $n = 3$ we get,
$2 (3) - 4 = 2 \neq 4$
So, LHS is not equal to RHS

(d) Substituting $n = - 4$ we get,
$2 (- 4) - 4 = - 12 \neq 4$
Hence, LHS is not equal to RHS

Therefore, $n = 4$ is a solution to the equation.

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