Question

Dada a função quadratica

Answer 1

f( x ) = x² - 6x + 8

f( 4 ) = ( 4 )² - 6 . 4 + 8

f( 4 ) = 16 - 24 + 8

f( 4 ) = 24 - 24

f( 4 ) = 0

Opção E)

[ AC/DC ]

Answer 2

$\large \boxed{ \begin{array}{l} \sf \: f(x) = x {}^{2} - 6x + 8 \\ \\ \sf \: f(4) = (4 ){}^{2} - 6.(4) + 8 \\ \\ \sf \: f(4) = 16 - 24 + 8 \\ \\ \sf \: f(4) = - 8 + 8 \\ \\ \boxed{ \boxed{ \sf{f(4) = 0}}} \leftarrow \sf{Letra \: E}\end{array}}$