Tolong bantu tugas mtk

19) x² + 3x = 10
x² + 3x - 10 = 0
(x + 5)(x - 2)
x = - 5 atau x = 2

21) x² + 8x + 12 = 0
(x + 6)(x + 2)
x = - 6 atau x = - 2