Class 9 Exam > Class 9 Questions > If x + y = 3, x2+ y2= 5 then xy isa)1b)3c)2d)...
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If x + y = 3, x2 + y2 = 5 then xy is
- a)1
- b)3
- c)2
- d)5
Correct answer is option 'C'. Can you explain this answer?
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If x + y = 3, x2+ y2= 5 then xy isa)1b)3c)2d)5Correct answer is option...
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If x + y = 3, x2+ y2= 5 then xy isa)1b)3c)2d)5Correct answer is option...
Given:
x y = 3
x² y² = 5
To find: xy
Solution:
We have to use the formula (a+b)² = a² + 2ab + b²
We can write x² y² as (xy)²
Therefore, (xy)² = 5
Taking square root on both sides, we get
xy = √5
So, option (c) 2 is the correct answer.
x y = 3
x² y² = 5
To find: xy
Solution:
We have to use the formula (a+b)² = a² + 2ab + b²
We can write x² y² as (xy)²
Therefore, (xy)² = 5
Taking square root on both sides, we get
xy = √5
So, option (c) 2 is the correct answer.
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If x + y = 3, x2+ y2= 5 then xy isa)1b)3c)2d)5Correct answer is option...
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If x + y = 3, x2+ y2= 5 then xy isa)1b)3c)2d)5Correct answer is option 'C'. Can you explain this answer?
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