The computation shows that the two points on the x axis that are 10 units from (1, 8) are 7 and -5.
We can use the distance formula to get the value
✓(x - 1)² + (0 - 8)² = 10
x² - 2x + 1 + 64 - 100 = 0
x² - 2x - 35 = 0
(x - 7)(x + 5) = 0
x = 7 or -5
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