Answer:
b) x = 12
Explanation:
By intersecting secant theorm(secant-secant theorem),
7(7 + x - 7) = 6(6 + x - 4)
⇒ 7(x) = 6(2 + x)
⇒ 7x = 12 + 6x
⇒ 7x - 6x = 12
⇒ x = 12
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