(4+√5) (4-√5)
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Posted by Arvind Yadav Yadav 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
(a -b) (a+ b) = a2 - b2
(4+√5) (4-√5) = (4)2 - (√5)2 = 16 - 5 = 11
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