The formula for two secants is:
(A+B)*B = (C+D)*D
In the picture :
A = 5
B = 3
C = X
D = 4
(5 +3) * 3 = (X +4)*4
Use distributive property:
24 = 4x + 16
Subtract 16 from both sides:
4x = 8
Divide both sides by 4:
X = 8/4
X = 2
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