Let vec{a}=left(egin{array}{c}-1 \ 2 \ 3end{array} ight), vec{b}=left(egin{array}{c}2 \ -2 \ 0end{array} ight), vec{c}=left(egin{array}{c}3 \ 0 \ -1end{array} ight), alpha in mathbb{R}. Compute i. 2 vec{a}-vec{b}+5 vec{c}; ii. 4 vec{a}+alpha vec{b}-2 vec{c}
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