Find the value of a + b + c, when a² + b² + c² = 38 and ab + bc + ca = -1?
- 8
- 6
- 5
- None of these
Explanation
Given:
a² + b² + c² = 38
ab + bc + ca = -1
Using the identity:
(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)
= 38 + 2(-1)
= 38 - 2
= 36
a + b + c = √36
= 6
Related MCQs
- 25
- 30
- 35
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 10x = - 3
- 2x = - 27
- 2x = 27
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 1, 4, -21
- 1, 4, 21
- -1, 4, -21
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 2/x + 12/(x +5)
- 3/x + 22/(x +5)
- 4/x + 16/(x +5)
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Leave a Reply
Your email address will not be published. Required fields are marked *