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Solve for x: 34x + 1=(27)x + 1 - Mathematics

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Question

Solve for x:

`3^(4x  +  1) = (27)^(x  +  1)`

Sum

Solution

`3^(4x  +  1) = (27)^(x  +  1)`

⇒ `3^(4x  +  1) = (3^3)^(x  +  1)`

⇒ `3^(4x  +  1) = (3)^(3^((x  +  1)))`

⇒ 4x + 1 = 3(x + 1)

⇒ 4x + 1 = 3x + 3

⇒ 4x - 3x = 3 - 1

⇒ x = 2

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Solving Exponential Equations
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Chapter 7: Indices (Exponents) - Exercise 7 (B) [Page 100]

APPEARS IN

Selina Concise Mathematics [English] Class 9 ICSE
Chapter 7 Indices (Exponents)
Exercise 7 (B) | Q 1.3 | Page 100
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