Simplify.
(2a – 5)2

a.
42a – 7 + 16

b.
4a2 – 25

c.
4a2– 20a + 10

d.
4a2 – 20a + 25

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.