Answer:
x = 15
Step-by-step explanation:
Given a tangent and a secant to a circle from the same external point.
Then the square of the tangent is equal to the product of the external part and the entire secant, that is
x² = 9(9 + 16) = 9 × 25 = 225 ( take the square root of both sides )
x = [tex]\sqrt{225}[/tex] = 15
