Answer
-26+4
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I'm not sure but I think it is false.
For this case we have the following equation:

Let 
We have:

By definition, given an equation of the form 
The quadratic formula, to find the solution can be written as:

In this case we have:

Substituting in the quadratic formula we have:
See attached image
Answer:
Option B
PR=18mm
AB=7mm
All lengths of triangle PRQ are twice the lengths of ACB