Question

Calcule f(4) nas funções definidas pelas leis abaixo.

a) $f(x)= x^{2} +4x+4$

b) $f(x)= x^{2} -16x+16$

Answer 1

A) (4)^2 +4.4+4
f (4)= 16+16+4=36
》 f (4)=36

B) ) (4)^2 -16.4+16
f) (4)= 16- 64+16
f (4)= -48+16= -32
》 f (4)= -32

Answer 2

$\Large \sf a) f(x) = x^{2} + 4x +4 \dfrac {} {} \\\Large \sf f(4) = 4^{2} + 4.4 + 4 \dfrac {} {} \\\Large \sf f(4) = 16 + 16 + 4 \dfrac {} {} \\\Large \sf f(4) = 36 \dfrac {} {}$

$\Large \sf b) \dfrac {} {}\Large \sf f(x) = x^{2} - 16x + 16 \dfrac {} {}\\\Large \sf f(4) = 4^{2} - 16.4 + 16 \dfrac {} {}\\\Large \sf f(4) = 16 - 64+ 16 \dfrac {} {}\\\Large \sf f(4) = -32 \dfrac {} {}$