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IrinaK [193]
3 years ago
13

Please help please please please

Mathematics
1 answer:
STALIN [3.7K]3 years ago
4 0

Answer:

12

Step-by-step explanation:

By the rules of secants and tangents, ...

... AB² = AC×AD

... 6² = x(x + 9)

... x² +9x -36 = 0 . . . . . subtract 36

... (x +12)(x -3) = 0 . . . . factor

... x = 3 . . . . . . . . . . . . . positive solution

... AD = AC + CD = 3 + 9

... AD = 12

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