If a and b are the two values of t that satisfy
the equation t^2 â€“ 12t + 20 = 0, with a > b, what is the value of a â€“ b?
Choose the most appropriate option:
A) 2 B) 4 C) 6 D) 8 E) 10
Factor the left side of the equation:   t^2 â€“ 12t + 20 = 0   (t â€“ 2)(t â€“ 10) = 0   t = 2, t = 10   Thus, a = 10 and b = 2. So a â€“ b = 10 â€“ 2 = 8.   The answer is 8.
<result>D</result>
If a and b are the two values of t that satisfy
the equation t^2 â€“ 12t + 20 = 0, with a > b, what is the value of a â€“ b?