Answer:
Distribute:
4a^2+4ab+b^2+-2a^2+5ab+3b^2
Combine like terms:
(4a^2+2a^2)+(4ab+5ab)+(b^2+3b^2)
=2a^2+9ab+4b^2
When a shape's area is 9 times as great, the one dimension difference is √9=3 times as great. Therefore the length of all sides are 3 times of the corresponding sides of the original shape. The shortest side in the original shape is 3, the larger one is 3 times of that, which is 9. General rule, if a similar shape is x times ratio in terms of sides, the area will be x^2 times the original. <span>Hope it helps.</span>