The last option is your answer.
Line DE being parallel to Line AC means the angles that are connected (for lack of a better word) to the endpoints would be the same degree.
Answer:
2·(2a^3 - a^2+6)
Step-by-step explanation:
(((0-(5•(a^3)))-(7•(a^2)))+3)+(((9•(a^3))+5a^2)+9)
(((0-(5•(a^3)))-(7•(a^2)))+3)+((3^2a^3+5a^2)+9)
(((0-(5•(a^3)))-7a^2)+3)+(9a^3+5a^2+9)
(((0 - 5a^3) - 7a^2) + 3) + (9a^3 + 5a^2 + 9)
Pull out like factors :
4a3 - 2a2 + 12 = 2 • (2a3 - a2 + 6)
Hope it helps!
