Question

calcule...;--------;​

Answer 1

a)

$2x \times 4x + 2x + 3 \times 4x + 3 \\ 8x {}^{2} + 2x + 12x + 3 \\ 8x {}^{2} + 14x + 3$

b)

$3x {}^{3} + 12x - \frac{1}{2} x {}^{2} - 2$

c)

$2a \times 5a - 2ab + 3b \times 5a - 3b \times b \\ 10a {}^{2} - 2ab + 15ab - 3b {}^{2} \\ 10a {}^{2} + 13ab - 3b {}^{2}$

Answer 2

Resposta:

a= 8x²+14x+3

b=3x²+12x-1/2x²-2

c=10a²+13ab-3b²

Explicação passo-a-passo:

a. (2x+3)(4x+1)

2x.4x+2x+3.4x+3

8x²+2x+3.4x+3

8x²+2x+12x+3

8x²+14x+3

b. (3x-1/2)(x²+4)

3x²+3x.4-1/2x²-1/2.4

3x²+3x.4-1/2x²-1/2.4

3x²+12x-1/2x²-1/2.4

3x²+12x-1/2x²-2

c. (2a+3b)(5a-b)

2a.5a-2ab+3b.3a-3b.b

10a²-2ab+3b.5a-3b.b

10a²-2ab+15ab-3b.b

10a²-2ab+15ab-3b²

10a²+13ab-3b²