Question

Diketahui f (2x) = 4 x -2.tentukan:
A. F (x)
B. F (2),f (-5),f (-8)

Answer 1

F(2x) = 4x - 2
a. f(x) = 2x - 1
b. f(2) = 2(2) - 1
= 3
f(-5) = 2(-5) - 1
= -10 - 1
= -11
f (-8) = 2(-8) - 1
= -16 - 1
= - 17

Answer 2

F(2x) = 4x - 2
a. f(x) = ?
f(x) = 4(x/2) - 2
= 2x - 2

b. f(2) = ?
f(2) = 2(2) - 2
= 4 - 2 = 2

f(-5) = ?
f(-5) = 2(-5) - 2
= -10 - 2 = -12

f(-8) = ?
f(-8) = 2(-8) - 2
= -16 - 2 = -18

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