find the value of mod a bar+b bar when a=3i bar+4j bar,b=2i bar+2j bar-k bar
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simple adding them
we get
a+b=(3+2)i+(4+2)+(0-1)k
=5i+6j-k
now |a+b|=
=√5²+6²+1²
=√25+36+1
=√62
= 7.87
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