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f(a) = 3a+1 , g(a) = 1-2a
f(g(a)) = 28
3(1-2a) + 1 = 28
3-6a+1 = 28
-6a +4 = 28
-6a = 24
a = -4 (D)
1. D≥ 0
2. x₁+x₂ < 0 dan
3. x₁.x₂ > 0
1. b²-4ac ≥ 0
(-4p)²- 4p².1 ≥ 0
16p²-4p² ≥ 0
12p² ≥ 0
p seluruh bilangan real
2. x₁+x₂ =
=
=
p < 0
3. x₁.x₂ =
=
p ≠ 0
irisan : p seluruh bilangan real
p < 0
p ≠ 0
adalah : p < 0