Question

Sabendo que f(x) = 4x – 5 e g(x) = – 3x + 5. O valor de f(3) – g(–2) é igual a: ​

Answer 1

Para determinarmos o valor de f(3) e g(-2), substitua a incógnita ''x'' pelo número

$\underbrace{Veja:}$

Valor de f(3):

$\Rightarrow~~\sf f(x)=4x-5$

$\Rightarrow~~\sf f(3)=4.3-5$

$\Rightarrow~~\sf f(3)=12-5$

$\therefore~~~\sf f(3)=7$

$~~$

Valor de g(-2):

$\Rightarrow~~\sf g(x)=-3x+5$

$\Rightarrow~~\sf g(-2)=-3.(-2)+5$

$\Rightarrow~~\sf g(-2)=6+5$

$\therefore~~~\sf g(-2)=11$

$~~$

Valor de f(3) - g(-2):

$\Rightarrow~~\sf f(3)-g(-2)$

$\Rightarrow~~\sf (7)-(11)$

$\Rightarrow~~\sf 7-11$

$\therefore~\boxed{\sf -4~}~~\to~~resposta$