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Kelas 8 MatematikaBab Fungsi
4] f(x) = 2x² - 1
f(x + 1) = f(x - 1)
2(x + 1)² - 1 = 2 (x - 1)² - 1
◎◎ coret (-1) dan 2 ◎◎
x² + 2x + 1 = x² - 2x + 1
x² - x² + 2x + 2x = 1 - 1
4x = 0
x = 0
5] f(x) = -4x² + 2
f(x + 2) = f (x - 2)
-4(x + 2)² + 2 = -4(x - 2)² + 2
◎◎ coret (-4) dan (+2) di luar kurung ◎◎
x² + 4x + 4 = x² - 4x + 4
x² - x² + 4x + 4x = 4 - 4
8x = 0
x = 0
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Soal No. 4Soal No. 5
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