find the value of x
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Answer:
x = 5 is the correct answer.
Step-by-step explanation:
⇒ 2 × [3ˣ - 3ˣ⁻¹] = 324
⇒ 3ˣ - 3ˣ⁻¹ = 162
⇒ 3ˣ - [3ˣ ÷ 3¹] = 162 [∵ 3ˣ ÷ 3¹ = 3ˣ⁻¹]
Now let us assume 3ˣ as 't'
⇒ t - [t ÷ 3] = 162
⇒ [3t - t] ÷ 3 = 162
⇒ 2t ÷ 3 = 162
⇒ 2t = 162 × 3
⇒ t = 81 × 3
= 273
Now equating the value of 't' with 3ˣ.
⇒ 3ˣ = 273
⇒ 3ˣ = 3⁵
⇒ ∴ x = 5 ←ANSWER
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