Question

Tentukan diskriminan dari tiap persamaan berikut:

A) x² - 8x + 16 = 0
B) x² - akar 3 x - 1 = 0
C) 5x² + 9x = 2

Answer 1

A. x² - 8x + 16 = 0
a = 1, b = -8, c = 16
D = b² - 4ac = (-8)² - 4.1.16 = 64 - 64 = 0

b.x² - √3 x - 1 = 0
a = 1, b = -√3 , c = -1
D = b² -4ac = (-√3)² - 4.1.-1 = 7

c. 5x² + 9x - 2 = 0
a = 5, b = 9, c = -2
D = b² -4ac = 9² - 4.5.(-2) = 121