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Verified answer
Materi Persamaan Kuadrat <<<<<<Verified answer
Bentuk persamaan kuadratax² + bx + c = 0
x² - 2ax -3a² -4a -1 = 0
a = 1
b = -2a
c = -3a² - 4a - 1
mempunyai akar kembar, syarat : D = 0
rumus umum : b² - 4ac = 0
(-2a)² -4(1)(-3a² -4a -1) = 0
4a² +12a² + 16a +4 = 0
16a² + 16a + 4 = 0
=============== × ¼
4a² + 4a + 1 = 0
(2a + 1)² = 0
akar²nya yaitu :
2a + 1 = 0
2a = -1
a = -½
jawaban : b