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f(x) = 2x -1
f(x+1) = 2( x +1) - 1
= 2x + 2 - 1
= 2x + 1
f(x²) = 2(x²) - 1
= 2x² - 1
nomer 2
f(x) = 3x + 2
f(x + 2) = 3(x + 2) + 2
= 3x + 6 + 2
= 3x + 8
f(1 - x²) = 3 ( 1 - x²) + 2
= 3 - 3x² + 2
= -3x² + 5
nomer 4
f(x) = 1 - 2x
f(x + 3) = 1 - 2( x + 3)
= 1 - 2x - 6
= -2x - 5
f ( -x +1) = 1 - 2x
= 1 - 2( -x + 1)
= 1 + 2x - 2
= 2x - 1