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Question-136719




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

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