is (5+√4)(5-√4) rational or irrational
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Answered by
15
(5+√4)(5-√4)
By the formula:
(a+b)(a-b)=a^2-b^2
5^2-√4^2
=25-4
=21, which is a rational number.........
By the formula:
(a+b)(a-b)=a^2-b^2
5^2-√4^2
=25-4
=21, which is a rational number.........
Answered by
17
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HERE IS UR ANSWER ---
Ques:: (5 + √4) (5 - √4)
It is in the form of (a + b) (a- b) which is equal to a^2 - b^2.
= (5)^2 - (√4)^2
= 25 - 4
= 21..
21 is a rational number ,
so (5 + √4) (5 - √4) is a rational number.
HERE IS UR ANSWER ---
Ques:: (5 + √4) (5 - √4)
It is in the form of (a + b) (a- b) which is equal to a^2 - b^2.
= (5)^2 - (√4)^2
= 25 - 4
= 21..
21 is a rational number ,
so (5 + √4) (5 - √4) is a rational number.
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