show that :(5+√5) (5-√5) is rational number
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Answered by
71
(5+√5) (5-√5)
⇒25-5√5+5√5-5
⇒20 is a rational number
⇒(5+√5) (5-√5) is rational number
⇒25-5√5+5√5-5
⇒20 is a rational number
⇒(5+√5) (5-√5) is rational number
Answered by
32
by multiplying we get
( 5+√5)(5-√5)=
25-5=20
which is a rational number
( 5+√5)(5-√5)=
25-5=20
which is a rational number
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