Question Number 136719 by mohammad17 last updated on 25/Mar/21
Commented by mohammad17 last updated on 25/Mar/21
$${how}\:{can}\:{solve}\:{this}\:{help}\:{me}\:{sir} \\ $$
Commented by mr W last updated on 25/Mar/21
$${if}\:\boldsymbol{{A}}\centerdot\boldsymbol{{B}}=\mathrm{0}\:{then}\:\boldsymbol{{A}}\bot\boldsymbol{{B}} \\ $$$${here}:\:\boldsymbol{{A}}\centerdot\boldsymbol{{B}}=\mathrm{3}×\mathrm{2}+\mathrm{1}×\left(−\mathrm{2}\right)−\mathrm{4}×\mathrm{1}=\mathrm{0} \\ $$$${therefore}\:\boldsymbol{{A}}\bot\boldsymbol{{B}} \\ $$