Question

Efetue os produtos abaixo:

a) x ( 2x – 3)

b) 2b² (4a + b)

c) –xy ( x² - 2xy + y²)

d) (2x – 3).(x² - 2x + 5)

e) (a² - 2a).( 3a – 3)

Answer 1

Resposta:

a) x ( 2x – 3)

$2 {x}^{2} - 3x$

b) 2b² (4a + b)

$8a {b}^{2} + 2 {b}^{3}$

c) –xy ( x² - 2xy + y²)

$- {x}^{3}y + 2x {y}^{2} - x {y}^{3}$

d) (2x – 3).(x² - 2x + 5)

${2x}^{3} - {4x}^{2} + 10x - 3 {x}^{2} + 6x - 15 \\ 2 {x}^{3} - 7 {x}^{2} + 16x - 15$

e) (a² - 2a).( 3a – 3)

${3a}^{3} - 3a {}^{2} - 6 {a}^{2} + 6a \\ {3a}^{3} - 9 {a}^{2} + 6a$