C.7 d.14 geometry math question no guessing and show work

C.7

In 45 45 90 degree triangles y is equal to 7√2/2 and x is 7√2/2*√2 which makes it 7*2/2 to 14/2 to just 7

i really dont know

step-by-step explanation:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square