GesiRae1
GesiRae1 GesiRae1
  • 21-11-2017
  • Mathematics
contestada

-3x(x+4)+15=6-4x
This is for homework please help

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dalmagro78
dalmagro78 dalmagro78
  • 29-05-2018
[tex]-3x(x+4)+15=6-4x[/tex]
[tex]-3x^2-12x+15=6-4x[/tex]
[tex]-3x^2-12x+4x+15-6=0[/tex]
[tex]-3x^2-8x+9=0[/tex]

this is the form 
[tex]ax^2+bx+c=0[/tex]
 with a=-3, b=-8 and c=9

the solutions are

[tex]x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}[/tex]

put a, b and c we have

[tex]x=\frac{-4\pm \sqrt{43}}{3}[/tex]
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