Question

Como resolver essa equação incompleta abaixo sendo x número real?

 

3x² = x²+7

4          6

Answer 1

 

 

o mmc = 12

 

9x^2 = 2x^2 + 14

9x^2 - 2x^2 - 14 = 0

7x^2 =  14

x^2 =  14/7

x^2 = 2

x= +/-V2

Answer 2

tire o mmc de 4 e 6        

 

 

          = 12

 

 

                         9x^2 = 2x^2 + 14

                                           9x^2 - 2x^2 - 14 = 0

                                                          7x^2 =  14

                                                                 x^2 =  14/7

                                                                 x^2 = 2

                                                                 x= +/-V2