science
Grade-11
Easy
Question
The angle between P +Q and P-Q will be
- 90
- 0
- 180
- 0 to 180
Hint:
0 to 180
The correct answer is: 0 to 180
(P+Q).(P-Q)
= P² + PQ cos α - PQ cos α - Q²
= P² - Q²
Since dot product may be positive, negative or zero. Therefore, the angle between (P+Q) and (P-Q) can be acute, obtuse or 90°
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