Question

simlify (4+√5)(4-√5) and identify whether the number is rational or irrational

Answer 1

hey here is your answer.
a=4
b=√5
(a+b)(a-b)=a^2 -b^2
so , 4^2-√5^2
16-5=11 which is rational .

Answer 2

Hey friend
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Question: Simplify (4+√5)(4-√5) and identify whether the number is rational or irrational and identify whether the number is rational or irrational

Solution:

(a+b)(a-b) = a^2 -b^2

hence
(4+√5)(4-√5)  = 16-5 =11

11 is a rational number

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Hope this helps

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