bant jawab paka cara ya kak n pi 2, 3, 4

2. Persamaan kuadrat yang akar2nya 5 dan -1/2
x1 = 5 dan x2 = -1/2
PK:
x^2 - (x1 + x2)x + x1.x2 = 0
x^2 - (5 + (-1/2))x + 5(-1/2) = 0
x^2 - 9/2 x - 5/2 = 0 kali 2
2x^2 - 9x - 5 = 0
Jawaban B

3. Dik:
x1 + x2 = 1
x1.x2 = -6
PK
x^2 - (x1 + x2)x + x1.x2 = 0
x^2 - x - 6 = 0
Jawaban A

4. x1 = 2

x1 + x2 = -b / a = -(-9) / 2 = 9/2
2 + x2 = 9/2
x2 = 9/2 - 2 = 9/2 - 4/2 = 5/2

x1.x2 = c/a = 3m-2 / 2
2.5/2 = 3m-2 / 2
5 = 3m-2 / 2
3m - 2 = 10
3m = 12
m = 4

x1.x2 = 3m-2 / 2 = 3(4)-2 / 2 = 12-2 / 2 = 10/2 = 5
Jawaban C

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