Question

1) Estude o sinal pelo método prático das seguintes funções do 1° grau: ajudem por favorrrrrrrrrrrrrrrrrrrrrrr
a) f (x) = 2x + 3
b) f (x) = - 3x + 2
c) f (x) = - 5x
d) f (x) = -3x + 15
e) f (x) = 2x + 8

Answer 1

Resposta:

a) f (x)= 2x + 3

2x + 3 = 0

x = - 3 / 2

b) f (x) = -3x + 2

-3 x + 2 = 0

-3 x = - 2

x = 2/-3

x = 2/3

c) f (x) = - 5x

- 5 x = 0

x = 0/-5

x = 0

d) f (x) = -3x + 15

-3x + 15 = 0

x = 15/3

x = 5

e) f (x) = 2 x + 8

2x + 8 = 0

2x = -8

x = -8/2

x= -4