[(389 +99)² - (389-99)²] / (389 * 99)

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- 2
- 4
- 488
- 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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