If a =√7-√2 & B =√7-√2 then the value of a B is -----
A) 5
B) √5
C) 14
D) √14
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Answer:
aB = (√7-√2)(√7-√2)
aB = (√7-√2)²
aB = (√7)² + (√2)² - 2 × √7 × √2
aB = 7 + 2 - 2√14
aB = 9 - 2√14
or
(√7-√2)(√7-√2)
√7(√7-√2) -√2(√7-√2)
7-√14 -√14 + 2
7+2 -2√14
9 - 2√14
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