Question

Sejam os polinômios:
A=6x²-8x+1
B=-9x²-2x+7
C=7x³+x²

Calcule:
a)A+B=
b)B-A+C

Answer 1

$a) \\ \\ 6 x^{2} -8x+ 1+(-9 x^{2} -2x+7)= \\ \\ 6 x^{2} -8x+1-9 x^{2} -2x+7= \\ \\ 6 x^{2} -9 x^{2} -8x-2x+1+7= \\ \\ -3 x^{2} -10x+8$



$b) \\ \\ -9 x^{2} -2x+7-(6 x^{2} -8x+1)+7 x^{3} + x^{2} = \\ \\ -9 x^{2} -2x+7-6 x^{2} +8x-1+7 x^{3} + x^{2} = \\ \\7 x^{3} -9 x^{2} -6 x^{2} + x^{2} -2x+8x+7-1= \\ \\ 7 x^{3} -14 x^{2} +6x+6$