Question

1) Calcule a raiz das funções:

a) f(x) = –2x + 3

b) f(x) = –9x + 18

c) f(x) = –x – 5

d) f(x) = 5x – 3

2) Dada a função f(x) = –2x + 3, determine f(1).

3) Dada a função f(x) = 4x + 5, determine x tal que f(x) = 7.
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Answer 1

a) -2x + 3 = 0

3 = 2x

x = 3/2

b) -9x + 18 = 0

18 = 9x

x = 18/9

x = 2

c) -x - 5 = 0          

x = - 5

d) 5x - 3 = 0

5x = 3

x = 3/5

2)

f(1) = -2.1 + 3

f(1) = 1

3)

7 = 4x + 5

7 - 5 = 4x

4x = 2

x = 2/4