Question

Na função f(x) = -2x + 1/2 , determine o valor da expressão f ( 1 ) + f ( -2).

Answer 1

Resposta:

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

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

f(1)= -2+1/2

f(1)=-3/2

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

f(-2)= 4+1/2

f(-2)=9/2

Então f ( 1 ) + f ( -2)

-3/2+9/2=

$-3/2+9/2= \frac{ - 3 + 9}{2} = \frac{6}{2} = 3$

espero que isso ajude vc

Answer 2

Explicação passo-a-passo:

$\sf f(x)=-2x+\dfrac{1}{2}$

=> f(1)

$\sf f(1)=-2\cdot1+\dfrac{1}{2}$

$\sf f(1)=-2+\dfrac{1}{2}$

$\sf f(1)=\dfrac{-4+1}{2}$

$\sf f(1)=\dfrac{-3}{2}$

=> f(-2)

$\sf f(-2)=-2\cdot(-2)+\dfrac{1}{2}$

$\sf f(-2)=4+\dfrac{1}{2}$

$\sf f(-2)=\dfrac{8+1}{2}$

$\sf f(-2)=\dfrac{9}{2}$

Logo:

$\sf f(1)+f(-2)=\dfrac{-3}{2}+\dfrac{9}{2}$

$\sf f(1)+f(-2)=\dfrac{-3+9}{2}$

$\sf f(1)+f(-2)=\dfrac{6}{2}$

$\sf \red{f(1)+f(-2)=3}$