Question

f(×)=×+2,determinar:f(-1),f(21)e×|f(×)=0;

Answer 1

Olá!!!

Resolução!!!

f ( x ) = x + 2

• f ( - 1 )

f ( x ) = x + 2
f ( - 1 ) = - 1 + 2
f ( - 1 ) = 1

• f ( 21 )

f ( x ) = x + 2
f ( 21 ) = 21 + 2
f ( 21 ) = 23

• f ( x ) = 0

f ( x ) = x + 2
0 = x + 2
x + 2 = 0
x = - 2

Espero ter ajudado,!