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Question

What should come in place of both the question marks in the equation `?/sqrt(128)` =  `sqrt(162)/?`


Options:
A .  12
B .  14
C .  144
D .  196
Answer: Option A

Let  `x/sqrt(128)` = `sqrt(162)/x`

Then , `x^2` = `sqrt(128xx162)` =  `sqrt(64 xx 2 xx 18 xx 9)` =` sqrt(8^2 xx 6^2 xx 3^2)` =  8 x 6 x 3 = 144

`:.`  `x` = ` sqrt(144) `= 12.




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