simplify (15m+11n)^2-(15m-11n)^2
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formulae for this kind of sum will help you directly without even wasting further time
suppose, (a+b)² - (a-b)²
= a² +2ab+b² - (a² - 2ab+b²)
= a² +2ab+b² - a² + 2ab -b²
= 4ab
therefore (15m+11n)²-(15m-11n)²
let a = 15m , b = 11n
therefore (a+b)² - (a-b)² = 4ab
therefore , put the values and your answer will be done in no time
that is, 4 *(15m)*(11n) = 660mn ans
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