If a + b = 5 and a - b = √17 then the
value of ab should be
ans.
a3 + b3
(a + b)3
(a - b)3
a3-b3
Answers
Answered by
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Given :
a + b = 5
a - b = √17
To Find : Value of ab
Solution:
4ab = (a + b)² - (a - b)²
=> 4ab = 5² - (√17)²
=> 4ab = 25 - 17
=> 4ab = 8
=> ab = 2
Value of ab = 2
Another method:
a+b=5
a-b = √17
Adding both
=> 2a = 5 + √17
Subtracting
2b = 5 - √17
(2a)(2b) = (5 + √17)(5 - √17)
=> 4ab = 25 - 17
=> 4ab = 8
=> ab = 2
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