Question

1) Aplique a propriedade distributiva nas expressões.

a)(x +2)2:

b)(x +3)(x –2):

c)(x +3)(x –3):

d)(x –2)(x +2):

e)(x –1)3:

f)(x –1)(x –2)(x –3):

g)3(x –2) –2(x –2):

2) Determine o valor de cada incógnita nas equações.

a)2x –3 = 9.

b)3m +4 = m –2.

c)8 +y = 20 +4y.

Answer 1

Resposta 1)
a) 2x + 4
b) x2 + x - 6
c) x2 - 9
d) x2 - 4
e) 3x - 3
f) x3 - 6x2 + 11x - 6
g) x - 2

Respostas 2)
a) 2x - 3 = 9
2x = 9+3
2x = 12
x = 6

b) 3m + 4 = m - 2
3m - m = -2 -4
2m = -6
m = -3

c) 8 + y = 20 + 4y
y - 4y = 20 - 8
-3y = 12
y = - 4