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[(389 +99)² - (389-99)²] / (389 * 99)
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- 290
CORRECT ANSWER : 4
Discussion Board
Re
(A+B)(A-B)
Chaitanya 02-5-2015 02:32 PM
Remember this?
(a + b)^2 = a^2 + 2*a*b + b^2
(a - b)^2 = a^2 - 2*a*b + b^2
Ioannis 10-30-2014 11:32 AM
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