Answer:
Step-by-step explanation:
(6-√21, 6+√21)
x^2 - 12x = -15
(x - 6)^2 - 36 = -15
(x - 6)^2 = 21
x - 6 = ± √21
x = 6 ± √21
1/2 <u>or</u> 0.5 <u>or</u> 50%
3 + 3 = 6
3/6 = 1/2