How are real numbers used to describe real-world situations

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Aadc is formed by reflecting aabc across line segment ac, as shown in the figure. if the length of ac is 4 units, the area of aadc is square units.