Question

Diketahui f(x) = | 2x - 8 | + 5
nilai f(-3) - f(2) = ..

Answer 1

F ( -3) = (2 (-3) -8)+5
           -6-8+5
         = -9
f (2) = ( 2 (2) -8 ) +5
       = 4 - 8 +5
       = 1

jadi f (-3) - f (2) = -9 -1 = -10

Answer 2

F(x) = 2x - 8 + 5
f(-3) = 2.(-3) - 8 + 5
       = -6 -8 + 5
     = - 14 + 5
     = -9
f(2) = 2.2 - 8 + 5
     = 4 -8 + 5
     = -4 + 5
     = 1
f(-3) - f(2) = -9 - 1
               = -10