Answer:
{1, 17}
Step-by-step explanation:
x2 − 18x + 81 = 64 can be rewritten as x² - 18x + 81 = 64.
Next, x² - 18x + 81 can be rewritten as (x - 9)²
so that we now have:
(x - 9)² = 64.
Taking the sqrt of both sides, we get
x - 9 = ± 8
Then one root is x = 9 + 8 = 17, and the other is x = 9 - 8 = 1.
{1, 17} is the set of roots
