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x² + 3x + 2,25 - 2,25 - 2 = 0
(x + 3/2)² - 4,25 = 0
(x + 3/2)² - 17/4 = 0
(x + 3/2)² = 17/4
x + 3/2 = + 1/2 √17
x = 1/2 √17 - 3/2 atau x = -1/2 √17 - 3/2
b. 2x² - 4x - 1 = 0
2 (x² - 2x) - 1 = 0
2 (x² - 2x + 1) - 1 - 1 = 0
2 (x - 1)² - 2 = 0
2 (x - 1)² = 2
(x - 1)² = 1
x - 1 = + 1
x = 1+1 = 2 atau x = -1 + 1 = 0
c. 3x² + 8x + 4 = 0
(3x + 2)(x + 2) = 0
x = -2/3 atau x = -2
a.c= -2
(x)(x)
(soal bad)
2. a=2 b=-4 c=-1
a.c=-2
b=-4
1/2 (2x)V(2x)
(soal bad)
3 a=3 b=8 c=4
a.c(6,2)=12
b=8
1/3 (3x+6)(3x+2)
3x=-6 3x=-2
x=-3/3 x=-2/3
x=-2 x=-2/3