Question

3) Aplique a propriedade distributiva e simplifique as expressões algébricas: a)5 . ( a – 8 ) – 7a – 9 = b)– 6 . ( n – 7) + 8 . ( - 4n + 5) = c)– ( x – 4) + 2 . ( x – 5 ) =

Answer 1

Resposta:

a)5 . ( a – 8 ) – 7a – 9 =

5a - 40 - 7a - 9

5a - 7a - 9 - 40

-2a - 49

b)– 6 . ( n – 7) + 8 . ( - 4n + 5) =

-6n - 42 - 32n + 40

-6n - 32n - 42 + 40

-38n - 2

c)– ( x – 4) + 2 . ( x – 5 ) =

-x + 4 + 2x - 10

-x + 2x - 10 + 4

x - 6

Answer 2

Resposta:

A) 5×a -5×8 -7a -9

= 5a -40 -7a -9

=-2a -49

B) -6×n -6×(-7) +8×(-4n) +8×5

= -6n +42 -32n +40

= -26n +82

C) -1×x -1×(-4) +2×x +2×(-5)

= -x -4 +2x -10

= +x -14