Just use a calculator.
but if this is not a joke
the answer is 24.94
If we take the equation and multiply out the left side, we get....

+ 2xk +

=

+ x +

The x^2 and k^2 cancel out on both sides leaving us with this...
2kx = x
If we divide both sides by 2x to isolate k,
k ends up = 1/2
The circumference of the blue circle is about: 20 cm
The circumference of the orange circle is about: 10 cm
Answer:
I think the answer is hx to the power of 2
Step-by-step explanation: