Question

3- Simplifique os seguintes polinômios: a) (5x2-4x+7)-(3x2+7x-1)
b) (4x3-6x2+3x)-(7x3-6x2+8x)
c) 2x.(x2-2x+5)
d) (3x+4).(2x-1)

Answer 1

Resposta:

a) (5x2-4x+7)-(3x2+7x-1)

$5 {x}^{2} - 4x + 7 - 3 {x}^{2} - 7x + 1 \\ 2 {x}^{2} - 11x + 8$

b) (4x3-6x2+3x)-(7x3-6x2+8x)

$4 {x}^{3} - 6 {x}^{2} + 3x - 7 {x}^{3} + 6 {x}^{2} - 8x \\ - 3 {x}^{3} - 5x$

c) 2x.(x2-2x+5)

$2 {x}^{3} - 4 {x}^{2} + 10x$

d) (3x+4).(2x-1)

$(3x + 4) \times (2x - 1) \\ 6 {x}^{2} - 3x + 8x - 4 \\ 6 {x}^{2} + 5x - 4$