Question

determine algebricamente o zero das seguintes funções:
a) f(x)= 2x-8

b)f(x)= 5x

c)f(x)= 2x +1
3
d)f(x)= 4- 5x
2
e)f(x) =7x
3
f) f(x)= x - 1
3 5

Answer 1

Oi Fernanda

a) f(x) = 2x - 8

2x - 8 = 0
2x = 8
x = 8/2

x = 4

b) f(x)= 5x

5x = 0

x = 0

c) f(x) = (2x + 1)/3

(2x + 1)/3 = 0
2x + 1 = 0
2x = -1

x = -1/2

d) f(x) = (4 - 5x)/2

(4 - 5x)/2 = 0
4 - 5x = 0
5x = 4

x = 4/5 

e) f(x) = 7x/3

7x/3 = 0

x = 0

f) f(x) = x/3 - 1/5

5x/15 - 3/15 = 0

5x - 3 = 0
5x = 3

x = 3/5 

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