Question

F(x)=2x+4
F(x)=9x-3
F(x)=2x+16
F(x)=3x-12
F(x)=-x-7
F(x)=-x+1
F(x)=-4+20

Answer 1

Vamos lá...

a)

f(x) = 2x + 4

f(x) = 0

2x + 4 = 0

2x = - 4

x = - 4/2

x = - 2

b)

f(x) = 9x - 3

f(x) = 0

9x - 3 = 0

9x = 3

x = 3/9

x = 1/3

c) f(x) = 2x + 16

f(x) = 0

2x + 16 = 0

2x = - 16

x = - 16/2

x = - 8

d)

f(x) = 3x - 12

f(x) = 0

3x - 12 = 0

3x = 12

x = 12/3

x = 4

e)

f(x) = - x - 7

f(x) = 0

- x - 7 = 0

- x = 7 ( -1)

x = - 7

f)

f(x) = - x + 1

f(x) = 0

- x + 1 = 0

- x = - 1 ( -1)

x = 1

g)

f(x) = - 4x + 20

f(x) = 0

- 4x + 20 = 0

- 4x = - 20 ( -1)

4x = 20

x = 20/4

x = 5

Espero ter ajudado.