Respuesta :

We have to evaluate the expression 7x^2 - 5x + 3 - (2x^2 +7x-4):

[tex]\begin{gathered} 7x^2-5x+3-(2x^2+7x-4) \\ (7-2)x^2+(-5-7)x+(3-(-4)) \\ 5x^2-12x+(3+4) \\ 5x^2-12x+7 \end{gathered}[/tex]

Answer: B. 5x2 - 12x +7