Question

Diketahui f(x + 3) = 2x - 3x + 1. Tentukan Nilai f(-2) = ...
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Answer 1

f(x + 3) = 2x - 3x + 1

f(-2) = ??

Cara 1 :

x + 3 = -2

x = -2 - 3

x = -5

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

f(-2) = -10 - (-15) + 1

f(-2) = -10 + 15 + 1

f(-2) = -10 + 16

f(-2) = 6

Cara 2 :

x + 3 = a

x = a - 3

f(-2) = 2(-2 - 3) + 3(-2 - 3) + 1

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

f(-2) = -10 - (-15) + 1

f(-2) = -10 + 15 + 1

f(-2) = -10 + 16

f(-2) = 6

:)

Answer 2

f(x + 3) = 2x - 3x + 1

f(x + 3) = -1x + 1

f(x + 3) = -1 ( x + 3 ) + 4

f(x) = -1x + 4

f(-2) = -1(-2) + 4

f(-2) = 2 + 4

f(-2) = 6