Question

dada a funçao de 1 grau f(x)= 1-5/2x, calcule A=f(0) B=f(-1) C=F(1/5)

Answer 1

A) f(0) = 1 - (5/2)*0 
     f(0) = 1

B) f(-1) = 1 - (5/2)*(-1)
     f(-1) = 1 + 5/2
     f(-1) = 7/2

C) f(1/5) = 1 - (5/2)*(1/5)
     f(1/5) = 1 - 1/2
     f(1/5) = 1/2

^^

Answer 2

F(0) = 1-5/2x0
F(0) = -4/0
F(0) = -4

F(-1) = 1-5/2x(-1)
F(-1) = -4/-2
F(-1) = 2


F(1/5) = 1-5/2x1/5
F(1/5) = -4/2x 1/5
F(1/5) = -4/ 2/1 x 1/5
F(1/5)= -4/ 2/5
F(1/5) = -4/1 / 2/5
Conserva a primeira e multiplica pelo inverso da segunda :
F(1/5) = -4 x 5 = -20
1 x 2 = 2
F(1/5)= -20/2 = -10