Question

Me ajuda a resolver essas contas (+4xy).(+3xy)
(-4a).(-2a+3b)
(x²y³).(x+3xy)
(x+2).(x+3)
(x-2).(x+y)

Answer 1

( 4¹y¹ ) ( 3x¹y¹ )  = 12x²y²    ( soma expoentes  1 + 1 = 2 )

b

( - 4a¹) ( 2a¹ + 3b¹ )

-4a¹ * 2a¹ =  - 8a²

-4a¹ * 3b¹  = - 12a¹b¹

resposta >>> - 8a² - 12a¹b¹  *****

c

x²y³ ( x¹ + 3x¹y¹ )

x²y³ * x¹ = x³y³

x²y³ *  3x¹y¹ =  3x³y^4

resposta >>>x³y³ + 3x³y^4

d

( x + 2) ( x + 3 )

x * x  = x² ***

x * 3 = 3x ****

2 * x = 2x ***

2 * 3 = 6 ****

resposta >>> x² + 3x + 2x + 6  ou   x² + 5x + 6 ****

e

( x - 2 ) ( x + y )

x*x = x²

x * y = xy

-2 * x = -2x

-2 * y = -2y

Resposta >> x²  + xy -2x - 2y  ****