Tolong bantu saya yah nomor 8,9 dan 10

Tolong bantu saya yah nomor 8,9 dan 10

Jawaban:

${x}^{2} - 3x + 2 = 0 \ x = frac{ 3 + sqrt {9 - 8} }{2} = 2 \ x = frac{3 - sqrt{9 - 8} } {2} = 1$

$2 {x}^{2} + 16x - 18 = 0 \ 2 {x}^{2} + 18x - 2x - 18 = 0 \ 2x(x + 9) - 2(x + 9) = 0 \ (2x - 2)(x + 9) = 0 \ x = 1 : atau : x = - 9$