Question

if log(x² -21)=2,show that x=+11 and-11​

Answer 1

Answer:

Given:

log(x² -21)=2

To show:

x=+11 and-11

Solution:

As we know, Value of log100 = 2

{As, if there is no base in logarithmi, the base is considered to be 10 and we know 10² =100}

=> x² - 21 = 100

=> x² = 100+21

=> x² = 121

=> x = √121

=> x = +11 and-11

$\huge\mathscr\orange{Hence\:Proved}$

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Answer 2

Answer:

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