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I'm unsure how to properly express how to do this to you but here is a list of steps on how to solve it. Good luck.
For this case we have the following system of inequalities:

We must verify if the point
is a system solution
Inequality 1:

Inequality is not met!
Thus, the given point is not a system solution.
Answer:
The point is not a system solution.
ANSWER :
1. 2ab + c^2
2. (a + b)^2 or (a^2 + 2ab + b^2)
3. 2ab
EXPLANATION :
Recall that the area of a triangle is 1/2 base x height.
and the area of a square is the square of its side.
From the problem, we have 4 congruent triangles.
The area of four triangles is :

The area of the square is :

Then the total area will be :

It is equivalent to the area of the whole square in which the side is (a + b)
So that's :

Since both expressions are equal, we can equate them :
9/6 simplified= 3/2
..................................
For the paralleogram, X=9
The area is 63 and we know the length of the base which is 7. We can find the height (X) by 63/7=9