Question

1) Efetue:
a) (x2-3x) + (2 x2 + 4x + 1) =

b) (7 x y + 17 x-8 y + 9) + (12 x y + 2x - y) =

c) ( - 11 x2 - 2x + 3) + (+ 3 x2 + 4 x-5) =

d) (5 x2 - 4x + 2) - (10 x2 - 8 x + 5) =

e) (10 x2 - 8 x + 4) -(10 x? - 8 x + 5) =​

Answer 1

Resposta:

a) (x2-3x) + (2 x2 + 4x + 1)

${x}^{2} - 3x + 2 {x}^{2} + 4x + 1 \\ = 3 {x}^{2} + x + 1$

b) (7 x y + 17 x-8 y + 9) + (12 x y + 2x - y)

$7xy + 17x - 8y + 9 + 12xy + 2x - y \\ = 19xy + 19x - 9y + 9$

c) ( - 11 x2 - 2x + 3) + (+ 3 x2 + 4 x-5)

$- 11 {x}^{2} - 2x + 3 + 3 {x}^{2} + 4x - 5 \\ - 8 {x}^{2} + 2x - 2$

d) (5 x2 - 4x + 2) - (10 x2 - 8 x + 5)

$5 {x}^{2} - 4x + 2 - 10 {x}^{2} + 8x - 5 \\ = - 5 {x}^{2} + 4x - 3$

e) (10 x2 - 8 x + 4) -(10 x? - 8 x + 5)

$10 {x}^{2} - 8x + 4 - 10 {x}^{2} + 8x - 5 \\ = - 1$