Question

URGENTE! 60 PONTOS de matemática básica! Efetue as multiplicações. a) 3x (x + 4y + 1) b) 4ab (a + b – ab) c) (x – 1) (x + 5) d) (2y – 4) (3y² + y) e) (4t² + 3t) (- t² – 8)

Answer 1

Resposta:

a) 3x²+12xy+3x

b) 4a²b+4ab²-4a²b²

c) x²+4x-5

d) 6y³-10y²-4y

e) -4t4-3t³-32t²-24t

Explicação passo-a-passo:

Answer 2

Oie, Td Bom?!

a)

$= 3x \: . \: (x + 4y + 1)$

$= 3x \: . \: x + 3x \: . \: 4y + 3x$

$= 3x {}^{2} + 12xy + 3x$

b)

$= 4ab \: . \: (a + b - ab)$

$= 4aba \: . \: + 4ab \: . \: b - 4abab$

$= 4a {}^{2} b + 4ab {}^{2} - 4a {}^{2} b {}^{2}$

c)

$= (x - 1) \: . \: (x + 5)$

$= x \: . \: (x + 5) - 1(x + 5)$

$= x {}^{2} + 5x - x - 5$

$= x {}^{2} + 4x - 5$

d)

$= (2y - 4) \: . \: (3y {}^{2} + y)$

$= 2y \: . \: (3y {}^{2} + y) - 4(3y {}^{2} + y)$

$= 6y {}^{3} + 2y {}^{2} - 12y {}^{2} - 4y$

$= 6y {}^{3} - 10y {}^{2} - 4y$

e)

$= (4t {}^{2} + 3t) \: . \: ( - t {}^{2} - 8)$

$= 4t {}^{2} \: . \: ( - t {}^{2} - 8) + 3t \: . \: ( - t {}^{2} - 8)$

$= - 4t {}^{4} - 32t {}^{2} - 3t {}^{3} - 24t$

Att. Makaveli1996