soal mtk.. plis dibant pakai caraaa yaaa

8) (x+1)^2 = 9
x^2 + 2x + 1 = 9
x^2 + 2x - 8 = 0
(x - 2)(x + 4) = 0
x = 2 atau x = -4 ★
Jawaban A

9) 2x^2 - 7x + c = 0 dan D = 89
b^2 - 4ac = 89
(-7)^2 - 4(2)c = 89
49 - 8c = 89
8c = 49 - 89 = -40
c = -40/8 = -5 ★
Jawaban D

10) 3x^2 - x + 2 = 0
a + b = 1/3
a x b = 2/3
(a + b)^2 - ab = (1/3)^2 - 2/3 = 1/9 - 2/3 = -5/9 ★
Jawaban A

11) 2x^2 + x + 5 = 0
a + b = -1/2
a x b = 5/2
a^2 + b^2 = (a + b)^2 - 2ab
= (-1/2)^2 - 2(5/2)
= 1/4 - 5
= -19/4
= -4 3/4 ★
Jawaban E

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