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a = 3 --> a > 0
D = b² - 4ac --> D = 4 --> D >0
x1+x2 = 4/3 --> x1+x2 > 0
x1x2 = 1/3 --> x1.x2 = >0
akarnya real positif
.
b) a² + 14a + 49 = 0
a = 1
D= 0
x1+x2= -14 --> x1+x2 < 0
x1x2 = 49 --->x1x2 > 0
kedua akarnya real negatif