+0  
 
+3
915
6
avatar+8 

x(x+6)=36 what is x?

 May 13, 2014

Best Answer 

 #4
avatar+33616 
+11

zegroes said: well i tried giving him the easiest way i suppose......

Yes, but unfortunately you forgot part of the equation.  If you put x = 6 in the left-hand side you get 6(6+6) which is 6*12, which is not 36. The equation isn't one which factors nicely!  

Good try, but always check your answer by plugging it back into the original equation!

 May 13, 2014
 #1
avatar+3502 
+2

its six because the missing x to equal 36 will be 6 6x6=36

 May 13, 2014
 #2
avatar+33616 
+11

You can use the calculator here to solve this:

$${\mathtt{x}}{\mathtt{\,\times\,}}\left({\mathtt{x}}{\mathtt{\,\small\textbf+\,}}{\mathtt{6}}\right) = {\mathtt{36}} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{5}}}}{\mathtt{\,-\,}}{\mathtt{3}}\\
{\mathtt{x}} = {\mathtt{3}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{5}}}}{\mathtt{\,-\,}}{\mathtt{3}}\\
\end{array} \right\} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = -{\mathtt{9.708\: \!203\: \!932\: \!499\: \!369\: \!1}}\\
{\mathtt{x}} = {\mathtt{3.708\: \!203\: \!932\: \!499\: \!369\: \!1}}\\
\end{array} \right\}$$

Note there are two solutions.

 May 13, 2014
 #3
avatar+3502 
+2

well i tried giving him the easiest way i suppose......

 May 13, 2014
 #4
avatar+33616 
+11
Best Answer

zegroes said: well i tried giving him the easiest way i suppose......

Yes, but unfortunately you forgot part of the equation.  If you put x = 6 in the left-hand side you get 6(6+6) which is 6*12, which is not 36. The equation isn't one which factors nicely!  

Good try, but always check your answer by plugging it back into the original equation!

Alan May 13, 2014
 #5
avatar+3502 
+2

ugh fine the great alan is right im sorry....

 May 13, 2014
 #6
avatar
+3

fine alan was right ugh fine the great alan is right im sorry

----

Oh don’t worry about it, zegroes. A few more of these and you can join the Goldenleaf club. it is a great honor!

I’m trying to petition Admin to give a special golden leaf icon for that club. My last publicly posted petition was deleted, without ceremony nor comment. Pity. I thought it was a great idea. Unique talent should be recognized!

 May 13, 2014

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