gracerss gracerss
  • 28-08-2017
  • Mathematics
contestada

i don't know how to do this

i dont know how to do this class=
Relax

Respuesta :

coolstick
coolstick coolstick
  • 28-08-2017
I'll explain why, and you can put it in a two column proof as you wish due to that I don't know how to do them :P

Expanding it, we get x^2+3x-15=3x+10. After that, we can subtract 3x from both sides as well as subtract 10, getting x^2-25=0, and x^2=25. Therefore, 
x= +-sqrt(25)=+-5
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