Resposta:
a) (5x² + 5x-8) + (-2x² + 3x-2) =
[tex]5 {x}^{2} + 5x - 8 - 2 {x}^{2} + 3x + 2 \\ 3 {x}^{2} + 8x - 6[/tex]
b) (3x-6y + 4)+(4x+2y-2) =
[tex]3x - 6y + 4 + 4x + 2y - 2 \\ 7x - 4y + 2[/tex]
c) (5 x²-7x+2)+(2x²+7x-1)=
[tex]5 {x}^{2} - 7x + 2 + 2 {x}^{2} + 7x - 1 \\ 7 {x}^{2} + 1[/tex]
d) (4x+3y+1)+(6x-2y-9)
[tex]4x + 3y + 1 + 6x - 2y - 9 \\ 10x + y - 8[/tex]
e) (2x³ + 5x ²+4x) + (2x³-3x²+x)=
[tex]2 {x}^{3} + 5 {x}^{2} + 4x + 2 {x}^{3} - 3 {x}^{2} + x \\ 5 {x}^{3} + 2 {x}^{2} + 5x[/tex]
