Question

The number (3-√7)(3+√7) is
A) a natural number
B) a whole number
C) a rational number
D) all of these

Answer 1

Answer:

it is a rational number

Explanation:

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

so it is in the form of

$(\alpha +\beta) (\alpha -\beta )\\that is equal to \alpha ^{2} -\beta ^{2}$

3^2 -7^2

9-49=-40

Answer 2

4)All of these

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