Math, asked by yahootak, 1 year ago

please solve this question question
@ siddharatarao77

solve both of these questions

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Answers

Answered by siddhartharao77
11

(i)

Given : 2^(2x + 1) = 17 * 2^x - 2^3

It can be written as:

⇒ (2^x)^2 * 2^1 = 17 * (2^x) - 2^3

Let 2^x = a

⇒ (a)^2 * 2 = 17a - 2^3

⇒ 2a^2 - 17a + 8 = 0

⇒ 2a^2 - 16a - a + 8 = 0

⇒ 2a(a - 8) - (a - 8) = 0

⇒ (2a - 1)(a - 8) = 0

⇒ a = 8, a = 1/2.


Now,

(a)

2^x = 8

⇒ 2^x = 2^3

⇒ x = 3.


(b)

2^x = 1/2

⇒ 2^x = 2^-1

⇒ x = -1.


Therefore, the values of x = 3,-1.

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(ii)

Given : 5^(2x + 1) = 6 * 5^x - 1

It can be written as:

⇒ (5^x)^2 * 5^1 = 6 * (5^x) - 1

Let a = 5^x

⇒ (a)^2 * 5 = 6 * (a) - 1

⇒ 5a^2 = 6a - 1

⇒ 5a^2 - 6a + 1 = 0

⇒ 5a^2 - 5a - a + 1 = 0

⇒ 5a(a - 1) - (a - 1) = 0

⇒ (5a - 1)(a - 1) = 0

⇒ a = 1/5, 1


Now,

(a)

5^x = (1/5)

⇒ 5^x = 5^-1

⇒ x = -1.


(b)

5^x = 0

⇒ 5^x = 5^0

⇒ x = 0.


Therefore, the values of x = 0,-1.



Hope this helps!


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