Question

b) -5x . 3xy .у?
C)4(2n-5)
D)(4a-1)(2a+3)
e)2x ao quadrado +4x-1).(2x-3)

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Answer 1

B)

$- 5x \times 3xy \times y \\ \\ - {15x}^{1} \times {x}^{1} {y}^{1} \times {y}^{1} \\ \\ - {15x}^{1 + 1} {y}^{1 + 1} \\ \\ - {15x}^{2} {y}^{2}$

C)

$4(2n - 5) \\ \\ 4 \times 2n - 4 \times 5 \\ \\ 8n - 20$

D)

$(4a - 1)(2a + 3) \\ \\ 4a \times 2a + 4a \times 3 - 2a - 3 \\ \\ 8 {a}^{2} + 10a - 3$

E)

$2 {x}^{2} + (4x - 1) \times (2x - 3) \\ \\ 2 {x}^{2} + 8 {x}^{2} - 12x - 2x + 3 \\ \\ 10 {x}^{2} - 14x + 3$

espero ter ajudado