X²-9x+15=0 Akar persamaan Tolong di bantu teman teman

Persamaan Kuadrat

x² - 9x + 15 = 0
a = 1
b = -9
c = 15

Akar2nya ---> rumus abc

x1.2 = (-b ± √(b² - 4ac))/2a
x1.2 = (9 ± √(81 - 60))/2
x1.2 = (9 ± √21)/2

Akar" PK :
x1 = (9 + √21)/2 ✔
x2 = (9 - √21)/2 ✔