Understanding Basic Geometric Equations in Robotics Kinematics Analysis

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I was looking at a robotics kinematics analysis & there is one geometric equation assumed in the analysis which I can't seem to understand. I have a simplified diagram above.

In the above diagram
AC = a1
BC = a2
AB = x1
AX = x2

CX is perpendicular to AB

From here, how does one get to
x2 = (a1^2 - a2^2 + x1^2)/(2 * x1)
 
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Don't bother. I was able to get it using the law of cosines.