Question : What is the value of $\frac{(a+b)^2-(a-b)^2}{a b}$?
Option 1: 4
Option 2: 2
Option 3: 8
Option 4: 1
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Correct Answer: 4
Solution :
$(a + b)^2 - (a - b)^2$
$= (a^2 + 2ab + b^2) - (a^2 – 2ab + b^2)$
$= 4ab$
So, $\frac{(a+b)^2-(a-b)^2}{a b}$
$=\frac{4ab}{ab}$
$=4$
Hence, the correct answer is 4.
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