Question

Dada a função f(x) = 7x + 21 encontre :

a) f(0)

b) f(-4)

c) x quando f(x) = 7

d) x quando y = -14​

Answer 1

A)

f( x ) = 7x + 21

f( 0 ) 7 . 0 + 21

f( 0 ) = 21

B)

f( x ) = 7x + 21

f( -4 ) = 7 . ( -4 ) + 21

f( -4 ) = -7

C)

f( x ) = 7x + 21

7 = 7 . x + 21

x = -2

D)

f( x ) = 7x + 21

14 = 7 . x + 21

x = -1