Question Number 119755 by zakirullah last updated on 26/Oct/20
Commented by bobhans last updated on 26/Oct/20
$$\boldsymbol{{a}}×\boldsymbol{{b}}\:=\:\begin{vmatrix}{\mathrm{3}\:\:\:\:−\mathrm{6}\:\:\:\:\:\:\:\:\:\mathrm{5}}\\{\mathrm{2}\:\:\:\:\:−\mathrm{1}\:\:\:\:\:\:\:\mathrm{4}}\end{vmatrix}=\:−\mathrm{19}\boldsymbol{{i}}−\mathrm{2}\boldsymbol{{j}}+\mathrm{9}\boldsymbol{{k}} \\ $$$$\boldsymbol{{b}}×\boldsymbol{{c}}\:=\:\begin{vmatrix}{\mathrm{2}\:\:\:\:\:−\mathrm{1}\:\:\:\:\:\:\:\mathrm{4}}\\{\mathrm{1}\:\:\:\:\:\:\:\:\:\mathrm{1}\:\:\:\:\:\:−\mathrm{1}}\end{vmatrix}=\:−\mathrm{3}\boldsymbol{{i}}+\mathrm{6}\boldsymbol{{j}}+\mathrm{3}\boldsymbol{{k}} \\ $$$$ \\ $$
Commented by zakirullah last updated on 27/Oct/20
$$\boldsymbol{{great}}! \\ $$