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Kelas 10 MatematikaBab Persamaan dan Fungsi Kuadrat
1] 3x = a
x = a/3
3x² - 7x + 5 = 0
3 . (a/3)² - 7 . (a/3) + 5 = 0
3 . a²/9 - 7a/3 + 5 = 0
a²/3 - 7a/3 + 5 = 0
✩✩ dikali 3 ✩✩
a² - 7a + 15 = 0
x² - 7x + 15 = 0
2] a - 1 = x
a = x + 1
x² - 2x + 3 = 0
(x + 1)² - 2 (x + 1) + 3 = 0
x² + 2x + 1 - 2x - 2 + 3 = 0
x² + 2 = 0