Question

Is the no. (3-√7) (3+√7) rational or irrational? How??????? plss give me step by step explanation
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Answer 1

Answer:

it is in the ( a+b) (a-b ) which is equal to a^{2} - b^{2}a

2

−b

2

9 - 7

= 2

so it is rational

Answer 2

Answer:

(3-√7) (3+√7) is irrational

Step-by-step explanation:

Since

(3-√7) (3+√7)

= 9 - 7

= 2

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