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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 -

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) =​

1 Resposta

Fernanda

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

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