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g[f(x)] = 4x²-6x+3
g[1-2x] = 4(1-2x)² - 6(1-2x) + 3
g[1-2x] = 4(4x²-4x+1) - 6 + 12x +3
g[1-2x] = 16x²-16x+4 +12x -3
g[1-2x] = 16x²-4x+1
kita misalkan 1-2x=a maka x = 1-a
2
g[a] = 16(1-a)² -4(1-a) +1
2 2
g[a] =8a² -16a +8 -4 + 4a +1
g[a] = 8a² -12a + 5
ganti kembali a denga x
g[x] = 8x² - 12x + 5