Question

seja f : R -> R uma função definida pela lei f(x)= 9
$x2$
+3x-7. determine:

a) f(3)
b) f (1/3)​

Answer 1

Explicação passo-a-passo:

f(x)=9x²+3x-7

a)

f(3) =9.(3)²+3.(3)-7

f(3)=9.(9)+9-7

f(3)=81+2

f(3)=83

b) f (1/3)

f(1/3)=9.(1/3)²+3.(1/3)-7

f(1/3)=9.(1/9)+3/3-7

f(1/3)=9/9+3/3-7

f(1/3)=1+1-7

f(1/3)=2-7

f(1/3)=-5

Espero ter ajudado!