Math help. Find x

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Math help. Find x



What is x and the steps to finding it?  Thank you:)
Proof Proof
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Re: Math help. Find x

Tangent and Secant
- If a secant and a tangent of a circle are drawn from a point outside the circle, then the product of the lengths of the secant and its external segment equals the square of the length of the tangent segment

6² = 4(x + 4)   ← substituted into theorem
36 = 4x + 16   ← distributive property
20 = 4x   ← subtracted 16 from each side
x = 5   ← divided each side by 4

- Proof