Question

3. If A = 2 + 3j+k and B = 3 * +2j+4k, + then find the value of (A + B)*(A - B). 17​

Answer 1

Answer:

3

Explanation:

Correct option is

B

8

3

A

×

B

=

∣

∣

∣

∣

∣

∣

∣

∣

i

^

3

2

j

^

1

−3

k

^

2

4

∣

∣

∣

∣

∣

∣

∣

∣

=(1×4−2×−2)

i

^

+(2×2−4×3)

j

^

+(3×2−1×2)

k

^

=8

i

^

−8

j

^

−8

k

^

∴ Magnitude of

A

×

B

=∣

A

×

B

∣=

(8)

2

+(−8)

2

+(−8)

2

=8

3

Answer 2

Answer:

5 + 5j + 15k = 17

Explanation:

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