Which of the following is not an irrational number?
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Answered by
1
Answer:
3rd one is not an irrational number.....
Answered by
1
Answer:
c) (2+√5)(2-√5) is not an irrational number
Step-by-step explanation:
- (2+√5)(2-√5)
- using the identity (a-b)(a+b)=a²-b², we get,
- =2²-(√5)²
- =4-5
- = -1
- and -1 is a rational number
- so option c is correct (Ans.)
- thank u.......
- please mark as brainliest
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