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persamaan : x² - 2x - 15 = 0
x² + 3x - 5x - 15 = 0
x(x + 3) - 5(x + 3) = 0
(x - 5) (x + 3) = 0
akar-akarnya : x = 5
x = -3
2.
persamaan : 2x² - 4x + 1 = 0
nilai : a = 2
b = -4
c = 1
diskriminan : D = b² - 4ac
= 16 - 8
= 8
3.
akar - akar : x = 2 dan x = 3
persamaan : (x - 2)(x - 3) = 0
x² - 5x + 6 = 0
Nomor 2
Nomor 3