Haryana Police Constable Model Paper 5

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Question : 16 of 100

Marks: +1, -0

Solve

4^{\2x}=1/128

$-5$
$-7$
$−7/2$
$−7/4$

Solution:

Given:

4^{\2x}=1/128

Calculation:

4^{2\x}=1/128

⇒2^{4\x}=1/2^{7}

⇒ 2^{4\x} = 2^{-7}

⇒ 4\x = -7

(\on \comparing \power)

∴ x = -7/4

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