Respuesta :

Answer:

x = 6

Step-by-step explanation:

Based on the two secants intersecting theorem, thus:

(x + 4)*4 = (3 + 5)*5

x*4 + 4*4 = (8)*5

4x + 16 = 40

4x + 16 - 16 = 40 - 16 (subtraction property of equality)

4x = 24

4x/4 = 24/4 (Division property of equality)

x = 6