Answer:
x = 4.5
Step-by-step explanation:
If two secants are drawn from an external point to a circle
Then the product of the measures of one secant's external part and that entire secant is equal to the product of the measures of the other secant's external part and that entire secant , then
8(8 + x) = 5(5 + 15)
8(8 + x) = 5 × 20 = 100 ( divide both sides by 8 )
8 + x = 12.5 ( subtract 8 from both sides )
x = 4.5
