Question

Calcule a raiz ou zero das funções:

a) f(x) = 3x + 12 b) f(x) = -10 +60x

c) f(x) = -2x + 9 d) f(x) = 7x -28

e) h(x) = -35 +7x f) g(x) = -6x +18​

Answer 1

Oie, Td Bom?!

>>> Substitua: f(x) = 0;

h(x) = 0;

g(x) = 0.

a)

f(x) = 3x + 12

0 = 3x + 12

- 3x = 12

x = 12/-3

x = - 12/3

x = - 4

b)

f(x) = - 10 + 60x

0 = - 10 + 60x

- 60x = - 10

x = - 10/-60

x = - 10÷10/-60÷10

x = - 1/6

c)

f(x) = - 2x + 9

0 = - 2x + 9

2x = 9

x = 9/2

d)

f(x) = 7x - 28

0 = 7x - 28

- 7x = - 28

x = - 28/-7

x = 28/7

x = 4

e)

h(x) = - 35 + 7x

0 = - 35 + 7x

- 7x = - 35

x = - 35/-7

x = 35/7

x = 5

f)

g(x) = - 6x + 18

0 = - 6x + 18

6x = 18

x = 18/6

x = 3

Att. Makaveli1996