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2x^3=3x^2    How would you calculate this?? Hur skulle du räkna ut detta??

 Aug 21, 2015

Best Answer 

 #2
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+5

$${\mathtt{2}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{3}}} = {\mathtt{3}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{2}}} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\frac{{\mathtt{3}}}{{\mathtt{2}}}}\\
{\mathtt{x}} = {\mathtt{0}}\\
\end{array} \right\} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\mathtt{1.5}}\\
{\mathtt{x}} = {\mathtt{0}}\\
\end{array} \right\}$$

Normal and cool

 Aug 21, 2015
 #1
avatar+128578 
+5

2x^3=3x^2    rewrite   as

 

2x^3  - 3x^2  = 0     factor

 

x^2 (2x - 3)  = 0       set both factors to 0.....and we have.....

 

x^2  = 0                                              and                            2x - 3 = 0

 

take the square root of both sides                                          add 3 to both sides

 

x = 0                                                                                    2x = 3

 

                                                                                          divide both sides by 2

 

                                                                                             x = 3/2

 

So.....the two solutions are   x = 0 aand x = 3/2

 

 

 Aug 21, 2015
 #2
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+5
Best Answer

$${\mathtt{2}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{3}}} = {\mathtt{3}}{\mathtt{\,\times\,}}{{\mathtt{x}}}^{{\mathtt{2}}} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\frac{{\mathtt{3}}}{{\mathtt{2}}}}\\
{\mathtt{x}} = {\mathtt{0}}\\
\end{array} \right\} \Rightarrow \left\{ \begin{array}{l}{\mathtt{x}} = {\mathtt{1.5}}\\
{\mathtt{x}} = {\mathtt{0}}\\
\end{array} \right\}$$

Normal and cool

Guest Aug 21, 2015

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