Solve by completing the square to solve the equation X^2-8x+20=5

X² - 8x + 20 = 5

x² - 8x + 20 - 5 = 5 - 5

x² - 8x - 15 = 0

x = - (-8) + / - √ ((-8) ² - 4 (1) (-15))

2 (1)

x = 8 + / - √ (64 + 60)

2

x = 8 + / - √124

2

x = 8 + / - 2 √31

2

x = 8 + / - 2 ((5.567764363)

2

x = 8 + / - 11.13552873

2

x = 8 + 11.13552873 x = 8 - 11.13552873

2 2

x = 20.13552873 x = - 3.13552873

2 2

x = 10.06776436 x = - 1.57764365