(3-√7)(3+√7) is rattional aur irrational
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Since (a+b) (a-b) = a^2 - b^2
Hence (3-√7)(3+√7)
= 3^2 - √7^2
= 9 - 7
=2.
Hence it is a rational no.
Hope it's helpful to u.
Hence (3-√7)(3+√7)
= 3^2 - √7^2
= 9 - 7
=2.
Hence it is a rational no.
Hope it's helpful to u.
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