let N = a b and N = BC show that N²-N²= 99 (B²-A² and hands in evaluate 91² - 19²
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Step-by-step explanation: a). (99)² -(11)². =(99+11)(99-11). [since a²-b²=(a+b)(a-b)]. =110*88. =9680. my knowledge if it is false please make it ...
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