Question

Dados os polinomios?

Answer 1

$A) 4 x^{2} -6x+7- x^{2} +3x-9 \\ 3 x^{2} -3x-2$
$B) 4 x^{2} -6x+7-(- x^{2} +3x-9) \\ 4 x^{2} -6x+7+ x^{2} -3x+9 \\ 5 x^{2} -9x+16$
$C)-(4 x^{2} -6x+7)-(- x^{2} +3x-9) \\ -4 x^{2} +6x-7+ x^{2} -3x+9 \\ -3 x^{2} +3x+2$
$D) -(-4 x^{2} +6x-7) + -x^{2} +3x-9) \\ -4 x^{2} +6x-7- x^{2} +3x-9 \\ -5 x^{2} +9x-16$