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|b|=√(1+1+0)=√2
|c|=√(16+9+4) = √29
w=a+b
w=[2+1, 5+1, 3+0] = [3, 6, 3]
|a+b|=√(9+36+9)=√54 = 3√6
v=a-c
v=[2-4, 5-3, 3+2] = [-2, 2, 5]
|a-c|=√(4+4+25)= √33