is the number (3-√7)(3+√7)rational or irrational?
chadharvishalp8obq0:
this is rational because (3-√7) (3+√7) = (3)2 -(√7)2 = 9-7 = 2. and 2 is a rational number
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12
Therefore it is rational number.
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Hope it helps u.....pls mark me as brainliest.
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Answered by
14
Hello Buddy.... !!! ☺☺✌
Here is your answer :
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Q : (3-√7)(3+√7)
➡ using identity ➖ (a+b)(a-b) = (a)^2-(b)^2
a = 3 , b = √7
= (3)^2 - (√7)^2
= 9 - 7 = 2
The remainder is rational number. Hence , (3+√7)(3-√7) is also a rational number.
____________________
Hope it helps dear !!!!!
Thanks...!!! ☺☺☺
Here is your answer :
-------------------------------------
Q : (3-√7)(3+√7)
➡ using identity ➖ (a+b)(a-b) = (a)^2-(b)^2
a = 3 , b = √7
= (3)^2 - (√7)^2
= 9 - 7 = 2
The remainder is rational number. Hence , (3+√7)(3-√7) is also a rational number.
____________________
Hope it helps dear !!!!!
Thanks...!!! ☺☺☺
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