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Solve for X : 9x+2 = 720 + 9x - Mathematics

Sum

Solve for x : 9x+2 = 720 + 9x

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Solution

9x+2 = 720 + 9x
⇒ 9x+2 - 9x = 720
⇒ 9x (92 - 1) = 720
⇒ 9x (81 - 1) = 720
⇒ 9x (80) = 720
⇒ 9x = 9
⇒ 9x = 91
⇒ x = 1

Concept: Solving Exponential Equations
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APPEARS IN

Selina Concise Mathematics Class 9 ICSE
Chapter 7 Indices (Exponents)
Exercise 7 (B) | Q 14.6 | Page 101
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