24+5x-x2 menggunakan rumus ABC

a=-1
b=5
c=24
klo gk salah

x1,2 = - b ± √D / 2a
x1,2 = (-5 ± √5² - 4(-1)(24)) / 2(-1)
x1,2 = (-5 ± √25 + 96) / -2
x1,2 = (-5 ± √121) / -2
x1 = -5+11 / -2
x1 = 6/-2 = -3
x2 = -5-11 / -2 = -16/-2 = 8