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Selesaikanlah. (x + 5) (x – 8) = 0, x^2 + 11x + 30 = 0, x^2 + 4x – 12 = 0, x^2 – 2x + 1 = 0

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Selesaikanlah.
1. (x + 5) (x – 8) = 0.
2. x2 + 11x + 30 = 0.
3. x2 + 4x – 12 = 0.
4. x2 – 2x + 1 = 0.
5. x2 – 9x = 0.
6. x2 + 9x = -18.

(x + 5) (x – 8) = 0.
x + 5 = 0 atau x – 8 = 0
x = -5 atau x = 8
Jawaban: x = -5, x = 8.


x2 + 11x + 30 = 0.
(x + 6) (x + 5) = 0
x + 6 = 0 atau x + 5 = 0
x = -6 atau x = -5
Jawaban: x = -6, x = -5.


x2 + 4x – 12 = 0.
(x – 6) (x + 2) = 0
x – 6 = 0 atau x + 2 = 0
x = 6 atau x = -2
Jawaban: x = 6, x = -2.


x2 – 2x + 1 = 0
(x – 1) (x – 1) = 0
(x – 1)2 = 0
x – 1 = 0
x = 1
Jawaban: x = 1.


x2 – 9x = 0
x(x – 9) = 0
x = 0 atau x – 9 = 0
x = 0 atau x = 9.
Jawaban: x = 0, x = 9.


x2 + 9x = -18
x2 + 9x + 18 = 0
(x + 6) (x + 3) = 0
x + 6 = 0 atau x + 3 = 0
x = -6 atau x = -3
Jawaban: x = -6, x = -3.

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