Which expression is equivalent to (x +9i)2? A. x2 + 18x + 81
B. x2 + 18xi – 81
C. x2 + 9xi +81
D. x2 + 9xi – 81

b) k’(6, 4); l’(3, 3)

step-by-step explanation:

a 270° clockwise rotation maps every point (x, y) to (y, -x). (it negates the x-coordinate and then switches it and the y-coordinate.)

this means the endpoints of the side congruent to kl, k' and l', would be mapped as:

k'(-4, 6)→(6, 4)

l'(-3, 3)→(3, 3)