First slide

Vectors

Question

If a and b are two vectors, then the value of $(a + b) \times (a - b)$ is

Moderate

A

$2 (b \times a)$
B

$- 2 (b \times a)$
C

b X a
D

$-$ b X a

Solution

(a + b) x (a $-$ b) = a x a $-$ a x b + b x a $-$ b x b
= 2(b X a)

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