Question

valendo 15 pontos alguém me ajuda por favor​

Answer 1

Resposta:

4.a- 11

b- (-14)

c- 10/3

d- (-3)

5.a- 0,4

b- (-1,6)

c- 0,48

6- 3

7- 1

Explicação passo-a-passo:

f(x) = 1 + 5x

4.a-

f(2) = 1 + 5 × 2

f(2) = 1 + 10

f(2) = 11

b-

f(-3) = 1 + 5 × (-3)

f(-3) = 1 - 15

f(-3) = -14

c-

f(2/3) = 1 + 5 × 2/3

f(2/3) = 1 + 10/3

f(2/3) = (3 + 10/3)

f(2/3) = 13/3

d-

f(-2/3) = 1 + 5 × (-2/3)

f(-2/3) = 1 - 10/3

f(-2/3) = (1 - 10)/3

f(-2/3) = -9/3

f(-2/3) = -3

5- f(x) = -5x + 2

a-

0 = -5x + 2

5x = 2

x = 0,4

b-

10 = -5x + 2

5x = 2 - 10

5x = -8

x = -1,6

c-

(-2/5) = -5x + 2

5x = 2 + 2/5

5x = (10+2)/5

5x = 12/5

x = 12/5 × 1/5

x = 12/25

x= 0,48

6-

f(x) = bx + 2

20 = 6b + 2

18 = 6b

b = 3

7- f(x) = ax + b

-4 = -2a + b

b = 2a - 4

4 = 2a + b

4 = 2a + 2a - 4

4 + 4 = 2a + 2a

8 = 4a

a = 2

b = 2 × 2 - 4

b = 4 - 4

b = 0

f(x) = 2x + 0

f(x) = 2x

f(1/2) = 2 × 1/2

f(1/2) = 1