Question

find the value of (2i-3j+4k)(3i+4j-4k)
class 12 math
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Answer 1

Answer:

a

=2i+3j+4k,

b

=3i+4j+2k,

c

=4i+2j+3k,

a . b

=(2i+3j+4k).(3i+4j+2k)

=6+12+8

=26

b . c

=(3i+4j+2k).(4i+2j+3k)

=12+8+6

=26

c . a

=(4i+2j+3k).(2i+3j+4k)

=8+6+12

=26

Hence, Since

a . b = b . c = c. a

So it is an Equilateral triangle

Answer 2

Answer:

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