Asked by aditya

(√7+√5)(√7-√5)
Answered by Bosnian
( a + b ) ( a - b ) = a ^ 2 - b ^ 2


( square root 7 + square root 5 ) ( square root 7 - square root 5 ) =

( square root 7 ) ^ 2 - ( square root 5 ) ^ 2 = 7 - 5 = 2
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