Question

1) Resolva a multiplicação do polinômio 2x ∙ (5x – 4y + 3)


A) 2x ∙ (5x – 4y + 3) = 10x² - 8xy + 6x

B) 2x ∙ (5x – 4y + 3) = 10x² - 8xy

C) 2x ∙ (5x – 4y + 3) = x² - xy + 6x



2) Resolva a multiplicação do polinômio (3x – 2y) ∙ (5x + y)


A) (3x – 2y) ∙ (5x + y) = 15x² + 3xy – 10xy – 2y² = 15x² – 2y²

B) (3x – 2y) ∙ (5x + y) = 15x² + 3xy – 10xy – 2y² = 15x² - 7xy – 2y²

C) (3x – 2y) ∙ (5x + y) = 15x² + 3xy – 10xy – 2y² = 5x² - 7xy – 2y²



3) Resolva a multiplicação do polinômio 15 ∙ (4z + 10y - 7)


A) 15 ∙ (4z + 10y - 7) = 60z + 150y - 105

B) 15 ∙ (4z + 10y - 7) = 60z + 150y - 10

C) 15 ∙ (4z + 10y - 7) = 6z + 150y - 105



4) Resolva a multiplicação do polinômio 21x² ∙ (20x – 14)


A) 21x² ∙ (20x – 14) = 420x³ - 294

B) 21x² ∙ (20x – 14) = 40x³ - 94x²

C) 21x² ∙ (20x – 14) = 420x³ - 294x²



5) Resolva a multiplicação do polinômio xy ∙ (3x + 2y – 3z)


A) xy ∙ (3x + 2y – 3z) = x²y + 2xy² – 3xy

B) xy ∙ (3x + 2y – 3z) = 3x²y + 2xy² – 3xyz

C) xy ∙ (3x + 2y – 3z) = 3x²y + xy² – yz



6) Resolva a multiplicação do polinômio (x – 2y) ∙ (x + 7y – 6z)


A) (x – 2y) ∙ (x + 7y – 6z) = x² + 7xy – 6xz – 2xy – 14y² + 12yz = x² + 5xy – 6xz – 14y² + 12yz

B) (x – 2y) ∙ (x + 7y – 6z) = x² + 7xy – 6xz – 2xy – 14y² + 12yz = x² + 5xy – 6xz – 14y²

C) (x – 2y) ∙ (x + 7y – 6z) = x² + 7xy – 6xz – 2xy – 14y² + 12yz = 5xy – xz – 14y² + 12yz



7) Resolva a multiplicação do polinômio 20 ∙ (25x – 14y)


A) 20 ∙ (25x – 14y) = 500x – 28

B) 20 ∙ (25x – 14y) = 500x – 280y

C) 20 ∙ (25x – 14y) = 5x – 280y



8) Resolva a multiplicação do polinômio (3a + 4b) ∙ (6a + 2b + 8c)


A) (3a + 4b) ∙ (6a + 2b + 8c) = 18a2 + 6ab +24ac + 24ab + 8b² + 32bc = 18a² + 30ab + 32bc

B) (3a + 4b) ∙ (6a + 2b + 8c) = 18a2 + 6ab +24ac + 24ab + 8b² + 32bc = 30ab + 24ac + 8b² + 32bc

C) (3a + 4b) ∙ (6a + 2b + 8c) = 18a2 + 6ab +24ac + 24ab + 8b² + 32bc = 18a² + 30ab + 24ac + 8b² + 32bc



9) Resolva a multiplicação do polinômio 12x² ∙ (50x – 40)


A) 12x² ∙ (50x – 40) = 600x³ - 480x²

B) 12x² ∙ (50x – 40) = 600x³ - 480x

C) 12x² ∙ (50x – 40) = 600x - 480x



10) Resolva a multiplicação do polinômio x ∙ (x² – y + z²)


A) x ∙ (x² – y + z²) = x³ - xy + xz²

B) x ∙ (x² – y + z²) = x³ - xy + x

C) x ∙ (x² – y + z²) = x³ - y + xz²​

Answer 1

Explicação passo-a-passo:

1.

$\sf 2x\cdot(5x-4y+3)=10x^2-8xy+6x$

Letra A

2.

$\sf (3x-2y)\cdot(5x+y)=15x^2+3xy-10xy-2y^2$

$\sf (3x-2y)\cdot(5x+y)=15x^2-7xy-2y^2$

Letra B

3.

$\sf 15\cdot(4z+10y-7)=60z+150y-105$

Letra A

4.

$\sf 21x^2\cdot(20x-14)=420x^3-294x^2$

Letra C

5.

$\sf xy\cdot(3x+2y-3z)=3x^2y+2xy^2-3xyz$

Letra B

6.

$\sf (x-2y)\cdot(x+7y-6z)=x^2+7xy-6xz-2xy-14y^2+12yz$

$\sf (x-2y)\cdot(x+7y-6z)=x^2+5xy-6xz-14y^2+12yz$

Letra A

7.

$\sf 20\cdot(25x-14y)=500x-280y$

Letra B

8.

$\sf (3a+4b)\cdot(6a+2b+8c)=18a^2+6ab+24ac+24ab+8b^2+32bc$

$\sf (3a+4b)\cdot(6a+2b+8c)=18a^2+30ab+24ac+8b^2+32bc$

Letra C

9.

$\sf 12x^2\cdot(50x-40)=600x^3-480x^2$

Letra A

10.

$\sf x\cdot(x^2-y+z^2)=x^3-xy+xz^2$

Letra A