(2+√5)(2-√5) expression is
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Answer:
(2+√5)(2-√5)
=(2^2-((√5)^2) formula (a+b)(a-b) =a^2-b^2
=4-5
=-1 (ans)..
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Your answer is -1.
2 plus root 5 x 2 minus root 5
(a+b)(a-b)=a square-b square
a=2 b=root 5
2 square minus root 5 square=4-5
4-5=-1
2 plus root 5 x 2 minus root 5
(a+b)(a-b)=a square-b square
a=2 b=root 5
2 square minus root 5 square=4-5
4-5=-1
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