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3x² + 24 = 4x² + 15
24-15 = 4x² - 3x²
9 = x²
x = 3 atau x = -3
2. a = a
b = -5
c = -3
D=0
b² - 4ac = 0
(-5)² - 4. a .-3 = 0
25 + 12a = 0
12a = -25
a = -
5. D = 132
a = 3
b= 6
c= 2p
b² - 4ac = 132
36 -4.3.2p =132
36 - 24p =132
-24p = 96
p = -4
6. D = 0
misal a = 1
b = 2m
c = (5m-4)
b² - 4ac = 0
4m² - 4.1.(5m-4) = 0
4m² -20m + 16 = 0
(4m-16)(m-1) = 0
*4m-16=0
= 4
*m-1 = 0
= 1
cuma bisa segini