Question

Dada a função f R > R definida por f (x) = 2x+2 calcule

A) f(-2)

B) f (0)

C) f (5)

D) f ( 1/2)

E) f ( -3/5)

Answer 1

Resposta:

A) -2

B) 2

C) 12

D) 3

E) 4/5

Explicação:

f(x) = 2x+2

A) f(-2) = 2×(-2)+2

f(-2) = -4+2

f(-2) = -2

B) f(0) = 2×0+2

f(0) = 0+2

f(0) = 2

C) f(5) = 2×5+2

f(5) = 10+2

f(5) = 12

D) f(1/2) = 2×1/2+2

f(1/2) = 2/1×1/2+2

f(1/2) = (2×1)/(1×2)+2

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

f(1/2) = 1+2

f(1/2) = 3

E) f(-3/5) = 2×(-3/5)+2

f(-3/5) = 2/1×(-3/5)+2

f(-3/5) = -(2×3)/(1×5)+2

f(-3/5) = -6/5+2

f(-3/5) = -6/5+2/1

f(-3/5) = -6/5+(5÷1×2)/5

f(-3/5) = -6/5+10/5

f(-3/5) = (-6+10)/5

f(-3/5) = 4/5