Question

which of the following is not irrational 'option is (A) (3+root7)(B) (3-root7) (C) (3+root7)(3-root7) (D) 3root7​

Answer 1

Answer:

(C) (3 + root 7)(3 - root 7) is the correct answer.

Step-by-step explanation:

(3+$\sqrt{7}$)(3-$\sqrt{7}$)

= $3^{2} - (\sqrt{7})^{2}$             ------------ [∵ (a+b)(a-b) = a² - b²]

= 9 - 7

= 2

Since 2 is not an irrational no. , (c) is correct

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