Geometry

The correct answer is A.63.

 

1. Since  is the midpoint of , we know that  (by the definition of a midpoint, which divides a line segment into two equal parts), so .

Given that  and , we can set up the equation:

.

 

2. Expand the left side of the equation:

Using the distributive property , where , , and , we get .

 

3. Solve for :

Subtract

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