Jawaban:
-4
x² - 3x - 2 = 0
Penjelasan dengan langkah-langkah:
2a - 1 = x
2a = x + 1
a = (x + 1)/2
2x² - 5x + 1 = 0
2 . ((x + 1)/2)² - 5 . (x + 1)/2 + 1 = 0
2 . (x² + 2x + 1)/4 - 5 (x + 1)/2 + 1 = 0
dikali 2
x² + 2x + 1 - 5x - 5 + 2 = 0
(4 .. 3) (a ...... 4)
(a .. a) (a+1 .. 3)
(4a + 3a + 3 ..... 16 + 9)
(a² + a² + a ..... 4a + 3a)
(7a + 3 ... 25)
(2a² + a .. 7a)
singular
49a² + 21a - (50a² + 25a) = 0
49a² + 21a - 50a² - 25a = 0
-a² - 4a = 0
-a (a + 4) = 0
-a = 0
a = 0
a + 4 = 0
a = -4
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Jawaban:
-4
x² - 3x - 2 = 0
Penjelasan dengan langkah-langkah:
2a - 1 = x
2a = x + 1
a = (x + 1)/2
2x² - 5x + 1 = 0
2 . ((x + 1)/2)² - 5 . (x + 1)/2 + 1 = 0
2 . (x² + 2x + 1)/4 - 5 (x + 1)/2 + 1 = 0
dikali 2
x² + 2x + 1 - 5x - 5 + 2 = 0
x² - 3x - 2 = 0
(4 .. 3) (a ...... 4)
(a .. a) (a+1 .. 3)
(4a + 3a + 3 ..... 16 + 9)
(a² + a² + a ..... 4a + 3a)
(7a + 3 ... 25)
(2a² + a .. 7a)
singular
49a² + 21a - (50a² + 25a) = 0
49a² + 21a - 50a² - 25a = 0
-a² - 4a = 0
-a (a + 4) = 0
-a = 0
a = 0
a + 4 = 0
a = -4