Pick out the irrational number from the following numbers: Select one: a. √7 / √28 b. √40 / √20 c. 1 / √ 9 d. - √49
Answers
Answer:
(b) √40/√20
Step-by-step explanation:
√40 = 2√10
__________ = √2
√20 = 2√5
√2 is an irrational number. so correct answer is (b)
Answer:
Concept: pick out the irrational number.
Given: a. √7 / √28 b. √40 / √20 c. 1 / √ 9 d. - √49
To find: an irrational number.
Step-by-step explanation:
as we know that an irrational number is a number in which the digits after the decimal point is non-ending and non- repeating .
so, a) √7 / √28 is not a irrational number as the divided answer of the two numbers is not a non-ending.
c) 1 / √ 9 is not a irrational number as the answer of the divide is not a non-repeating digits.
d. - √49 is not a irrational number as the root of this number is a perfect number.
so the answer is b. √40 / √20 as the breakup of the number is 2√10/2√5 which is √2.
and √2 is an non-ending and non-repeating .
∴b. √40 / √2 is an answer
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