If a + b = 5 and a - b = √17 then the value of ab should be _____?
- 2
- 3
- 4
- None of these
Explanation
Given:
a + b = 5
a - b = √17
Square both equations:
(a + b)² = 5²
a² + 2ab + b² = 25
(a - b)² = (√17)²
a² - 2ab + b² = 17
Subtract the second equation from the first:
4ab = 8
Divide by 4:
ab = 2
Related MCQs
- 10 and 30
- 15 and 25
- 20 and 20
- 12 and 28
اس سوال کو وضاحت کے ساتھ پڑھیں
- (t² + 4)(t - 2)(t - 2)
- (t² - 4)(t² - 4)
- (t² + 4)(t + 2)(t - 2)
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- +4
- -4
- +16
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
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