Question

Dada a função f(x) = 4x + 5, determine x tal que
a) f(x) = 7 b) f(x) = 3 c) f(x)= -1 d) f(x)= 0

Answer 1

Explicação passo-a-passo:

7 = 4x + 5 => 2 = 4x => x = 1/2

3 = 4x + 5 => 3 = 4x => x = -1/2

-1 = 4x + 5 => -1 = 4x => x = -3/2

0 = 4x + 5 => 0 = 4x => x = -5/4

Answer 2

Resposta:

a) 1/2

b) -1/2

c) -3/2

d) -5/4

Explicação passo a passo:

f(x) = 4x + 5

a) f(x) = 7

4x + 5 = 7

4x = 7 - 5

4x = 2

x = 2/4

x = 1/2

b) f(x) = 3

4x + 5 = 3

4x = 3 - 5

4x = -2

x = -2/4

x = -1/2

c) f(x)= -1

4x + 5 = -1

4x = -1 - 5

4x = -6

x = -6/4

x = -3/2

d) f(x)= 0

4x + 5 = 0

4x = -5

x = -5/4