a=3i-4j+6k and b=6i+5j-11k.if c=a×b.find the magnitude of a+b+c
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a = 3i-4j+6k
b = 6i+5j-11k
c =a×b
=>(3i-4j+6k)×(6i+5j-11k)
=>3i×(6i+5j-11k)-4j×(6i+5j-11k)+6k×(6i+5j-11k)
=>0+15k+33j+24k+0+44i+36j-30i+0
=>14i+69j+39k
NOW,
a+b+c = 23i+70j+34k
Magnitude of a+b+c
=>√(23²+70²+34²)
=>√(529+4900+1156)
=>√6585
=>81.14
Cheers!
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