A fake link ........................
2-5 inches =125miles
4-75inches=237.50 miles.
7.6=380miles
First multiply all terms by z
8-z^2=4z
Then order into standard form
-z^2-4z+8=0
Multiply the equation by -1
z^2+4z-8=0
Plug into quadratic equation
-4±√16-4(-8)
-4±√48
(-4±4√3)/2
-2±2√3
Final answer: z=-2± 2√3
I am just a middle-schooler, but like to answer, so I believe k is -1.
