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concept :- if a -√b is an irrational number then a + √b will be conjugate of it .
solution :-
given ,
a - √b = 3 - √7
hence, conjugate of it a + √b = 3 +√7
now,
A/c to question ,
product of (3 - √7) and (3 + √7)
so,
(3 - √7)( 3 + √7)
[ use, (a - b)(a + b) = a² - b² ]
= 3² - √7²
= 9 - 7
= 2
solution :-
given ,
a - √b = 3 - √7
hence, conjugate of it a + √b = 3 +√7
now,
A/c to question ,
product of (3 - √7) and (3 + √7)
so,
(3 - √7)( 3 + √7)
[ use, (a - b)(a + b) = a² - b² ]
= 3² - √7²
= 9 - 7
= 2
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