Answer:
(1)
And using factorization (common factor) we can do this:
(2)
(3)
Explanation:
In the figure attached we see the two triangles required one with a length of 6 and a width of 9 and the other with a length of 3x and width of 9.
For the first rectangle we know that the area can be founded with this formula:
And for the second rectangle the area can be founded similar like this:
And since we are interested in the sum of the two areas we have this:
We need a 3 different expression for the sum of the areas so we can do this:
(1)
And using factorization (common factor) we can do this:
(2)
(3)