(3-root7)(3+root7)is a : (a)natural number
(b)a rational number
(c)an irrational number
(d)both b and c
Answers
Answered by
1
it is a natural number
nishthaarya2:
apply the formula of a square - b square
Answered by
2
checking :
(3 - √7) ( 3 + √7)
------------------
By Formula,
a^2 - b^2 = (a + b)(a - b)
-----------------
(3)^2 - (√7)^2
9 - 7
2
Hence, it is a natural number.
i hope this will help you
(-:
(3 - √7) ( 3 + √7)
------------------
By Formula,
a^2 - b^2 = (a + b)(a - b)
-----------------
(3)^2 - (√7)^2
9 - 7
2
Hence, it is a natural number.
i hope this will help you
(-:
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