Question

1) Dada a função afim f(x) = - 2x + 3, determine:

a) f(1)

b) f(0)

c) f(13)



2) Dada a função f(x) = 4x + 5, determine x tal que f(x) = 7.



3) Determine a raiz de cada função a seguir:

a) y = 2x – 8

b) y = 4 – 4x

c) y = 5x + 12

d) y = – 2x - 11
Preciso dos cálculos tbm pfvr.​

Answer 1

Oie, Td Bom?!

1.

• f(x) = - 2x + 3

a) f(1) = - 2 . 1 + 3 = - 2 + 3 = 1

b) f(0) = - 2 . 0 + 3 = 0 + 3 = 3

c) f(13) = - 2 . 13 + 3 = - 26 + 3 = - 23

2.

• f(x) = 4x + 5

7 = 4x + 5

- 4x = 5 - 7

- 4x = - 2 . (- 1)

4x = 2

x = 2/4

x = [2 ÷ 2]/[4 ÷ 2]

x = 1/2

3.

a)

y = 2x - 8

0 = 2x - 8

- 2x = - 8 . (- 1)

2x = 8

x = 8/2

x = 4

b)

y = 4 - 4x

0 = 4 - 4x

4x = 4

x = 4/4

x = 1

c)

y = 5x + 12

0 = 5x + 12

- 5x = 12 . (- 1)

5x = - 12

x = - 12/5

d)

y = - 2x - 11

0 = - 2x - 11

2x = - 11

x = - 11/2

Att. Makaveli1996