Question 1206877
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{{{u = i + j}}}, {{{v= -j-6k}}}


{{{u + v = (i+j) + (-j-6k) = i+j-j-6k = i-6k}}}


{{{u - v = i + j-(-j-6k) = i+j+j+6k=i+2j+6k}}}


{{{5u- (1/2)v = 5(i+j)-(1/2)(-j-6k) = 5i+5j+j/2+6k/2=5i+5.5j+3k}}}



Find the difference between my solution and the solution by @MathLover1, which is incorrect.