Please... Solve it..
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Solution :
Given, 3²ʸ - 6 (3ʸ) = 27
⇒ (3ʸ)² - 6 (3ʸ) = 27
⇒ x² - 6x = 27 [ let, 3ʸ = x ]
⇒ x² - 6x - 27 = 0
⇒ x² - 9x + 3x - 27 = 0
⇒ x (x - 9) + 3 (x - 9) = 0
⇒ (x - 9) (x + 3) = 0
Either x - 9 = 0 or, x + 3 = 0
⇒ x = 9 , - 3
When x = 9
⇒ 3ʸ = 9
⇒ 3ʸ = 3²
Comparing like powers, we get y = 2
When x = - 3
⇒ 3ʸ = - 3
⇒ y log3 = log (- 3)
⇒ y = {log (- 3)}/(log3),
which has no defined value.
∴ the required solution is y = 2
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