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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 8

Solve for x: 55×5-4×5x512 = 5−5 - Mathematics

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Question

Solve for x: `(5^5 xx 5^(-4) xx 5^x)/(5^12)` = 5−5

Sum

Solution

`(5^5 xx 5^(-4) xx 5^x)/(5^12)` = 5−5 

⇒ `(5^(5 - 4 + x))/(5^12)` = 5−5 

⇒ `(5^(1 + x))/(5^12)` = 5−5 

⇒ `5^(1 + x – 12)` = 5−5

⇒ `5^(x – 11)` = 5−5

Equating the powers of same base 5.

x – 11 = – 5

x – 11 + 11 = – 5 + 11

x = 6

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Chapter 1: Numbers - Exercise 1.6 [Page 45]

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Samacheer Kalvi Mathematics [English] Class 8 TN Board
Chapter 1 Numbers
Exercise 1.6 | Q 7. (ii) | Page 45
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