(5+route 5 ) (5-route 5)
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Answered by
2
(a+b)(a-b) = a^2-b^2
hence, 25 - (√5)^2
25 - 5 =20
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Answered by
1
Step-by-step explanation:
(5+√5)(5-√5)
by using identity,
(a-b)(a+b)=a^2-b^2
=5^2-√5^2
=25-5
=20
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