+0  
 
+1
159
1
avatar+412 

Please help. Thank you.

smileysmileysmiley

 Sep 16, 2018
 #1
avatar+21242 
+8

Vectors:

 

\(\begin{array}{|lrcll|} \hline (1) & a+b &=& RS \\\\ (2) & 2a+2b+BA &=& 2c \\ & BA &=& 2\left(c-(a+b)\right) \\\\ (3) & c+PQ - \dfrac{BA}{2} &=& 2(a+b) \\ &c+PQ- \dfrac{2\left(c-(a+b)\right)}{2} &=& 2(a+b) \\ &c+PQ- \left(c-(a+b) \right) &=& 2(a+b) \\ &c+PQ-c+(a+b) &=& 2(a+b) \\ &PQ +(a+b) &=& 2(a+b) \\ &PQ &=& 2(a+b)-(a+b) \\ &PQ &=& a+b \quad & | \quad a+b = RS \\ &\mathbf{PQ} & \mathbf{=} & \mathbf{RS} \\ \hline \end{array}\)

 

laugh

 Sep 17, 2018
edited by heureka  Sep 18, 2018

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