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4x^2-12x=7

 Jun 8, 2016
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4x^2-12x=7    subtract 7 from both sides

 

4x^2 - 12x - 7  = 0       factor

 

(2x + 1) (2x - 7)   = 0      set each factor to 0

 

2x + 1  = 0                                                        2x - 7 = 0

 

subtract 1 from  both sides                             add 7 to both sides

 

2x   =   - 1                                                          2x   = 7

 

                            divide both sides by 2

 

x = -1/ 2                                                            x  = 7/2

 

And these are the two solutions

 

 

cool cool cool

 Jun 8, 2016

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