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Playing I Need Solution To This Vector Question - Education - Nairaland

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Playing I Need Solution To This Vector Question by henroo2003(op): 5:42pm On Jan 28, 2018
find the magnitude of the vector 2a-3b given two vectors a=6i+3j-k and b=4i-5j+8k
Re: Playing I Need Solution To This Vector Question by engrjosefz(m):
solution

a=6i+3j-k : 2a = 2(6i+3j-k) = 12i+6j-2k
b=4i-5j+8k : 3b= 3(4i-5j+8k) = 12i-15j+24k

2a-3b = (12i+6j-2k) - (12i-15j+24k)
==0i+21j-26k.
=√(0²+21²(-26)²

=√(0+441+676)
=33.42
Re: Playing I Need Solution To This Vector Question by sirusX(m): 7:55pm On Jan 28, 2018
engrjosefz:
solution

a=6i+3j-k : 2a = 2(6i+3j-k) = 12i+6j-2k
b=4i-5j+8k : 3b= 3(4i-5j+8k) = 12i-15j+24k

2a-3b = (12i+6j-2k) - (12i-15j+24k)
==0i+21j-26k.
ans.
You’re almost there....just determine the magnitude of your answer...Q.E.D
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