Respuesta :

[tex](3-x^2+2x)-(-3x^2-12+8x)[/tex]

Remove the parentheses:

[tex]3-x^2+2x+3x^2+12-8x[/tex]

Add like terms:

[tex]\begin{gathered} (3x^2-x^2)+(2x-8x)+(12+3) \\ 2x^2-6x+15 \end{gathered}[/tex]

Therefore, the value of b is -6

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