Answer:
x = 2
Step-by-step explanation:
For secants that intersect at an external point, the product of the external length and total length is a constant.
... 3·(3 +5) = 4·(4 +x) . . . . . write the two products, and set them equal
... 24 = 16 +4x . . . . . . . . . . eliminate parentheses
... 8 = 4x . . . . . . . . . . . . . . .subtract 16
... 2 = x . . . . . . . . . . . . . . . . divide by 4
