Respuesta :

Answer:

[tex]A+B=9x^2-6x+12[/tex]

Step-by-step explanation:

[tex]A=3x^2-2x+5\\B=2A-3\\\\B=2(3x^2-2x+5)-3\\B=6x^2-4x+10-3\\B=6x^2-4x+7\\\\A+B=(3x^2-2x+5)+(6x^2-4x+7)=9x^2-6x+12[/tex]