D. you have to construct the angle bisectors from two vertices on the triangle and then once you find the incenter you construct a perpendicular bisector from the incenter to one of the sides and then set the width to the intersection on the line and draw a circle.
You can use F.O.I.L. for this, which if you don't know stands for first outer inner last, so multiply the first in each parentheses, then the outer, then the inner, then the last. yours would be 3*5+3*√7+(-√7)*5+(-√7)*√7 => 15+3√7-5√7-7 => 8-2√7
Final answer:
8-2√7
Hope I could help :)
Answer: don't know sorry
Step-by-step explanation: