Question
Simplify the following expression: Â Â (400
+175) ² - (400 – 175) ² / (400 × 175)Solution
Let,  a =400 and b =175. (a +b) ² - (a – b) ² / (a × b)     … (1) As we know that – (a +b) ² - (a – b) ² =4 ab Put the value in Equation (1) =4ab /ab =4.
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