Question

Dada a função f definida por f(x) = 5x - 8, calcule:
a) f(0)
c) x tal que f(x) = 0
b) 5 (2)
d) x tal que f(x) = 7​

Answer 1

Resposta:

Explicação passo-a-passo:

Dada a função f definida por f(x) = 5x - 8, calcule:

a) f(0)

f(0) = 5 * 0 - 8

f(0) = 0 - 8

f(0) = - 8

b) x tal que f(x) = 0

f(x) = 5x - 8

0 = 5x - 8

5x = 8

x = 8 / 5

c) f(2/3)

f(2/3) = 5x - 8

f(2/3) = 5 * (2/3) - 8

f(2/3) = 10 / 3 - 8

f(2/3) = (10 - 24) / 3

f(2/3) = - 14 / 3

d) x tal que f(x) = 7

f(x) = 5x - 8

7 = 5x - 8

5x = 7 + 8

5x = 15

x = 15 / 5

x = 3

Answer 2

Resposta:

Explicação passo-a-passo:

$f(x)=5x-8\\\\a)\ y=5.0-8\\y=-8\\\\b)\ y=5.\frac{2}{3}-8\\y=\frac{10}{3}-8\\y=-\frac{14}{3}\\\\c)\ 5x-8=0\\5x=8\\x=\frac{8}{5}\\\\d)\ f(x)=7\\5x-8=7\\5x=7+8\\5x=15\\x=3$