Question

Dengan cara melengkapkan kuadrat sempurna,tentukan akar2 persamaan kuadrat berikut.
e. 2x^2 - 15x - 50 = 0

Mohon beserta caranya y...
Besok udh d kumpul...

Answer 1

Verified answer

2x² - 15x - 50 = 0
x² - (15/2)x - 25 = 0
x² - (15/2)x = 25
x² - (15/2)x + (225/16) = 25 + (225/16)
(x - 15/4)² = 625/16
x - 15/4 = √(625/16)
x - 15/4 = ± 25/4

x - 15/4 = 25/4
x = 25/4 + 15/4 = 40/4 = 10

x - 15/4 = -25/4
x = -25/4 + 15/4
x = -10/4 = - 5/2