simplify ( 2+√5)(2-√5)
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Answered by
4
(2+√5)(2-√5)= 2²-(√5)²== 4-5= -1
Hence answer is -1
Answered by
3
Answer:
(a+b)(a-b)=a²-b²)
( 2+√5)(2-√5)
=2²- (√5)² or
=2²-5
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