Answer:
x=10
Explanation:
Secant-Secant Formula:
(whole secant) x (external part) = (whole secant) x (external part)
(7+9) * 9 = ( x+8) *8
16*9 = ( x+8)*8
Divide each side by 8
16*9/8 = x+8
18 = x+8
Subtract 8 from each side
18-8 = x
10 =x
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