Question

I could use some help doing this simple math problem lol.

Answer 1

Answer: k=25

Explanation:

Answer 2

`D:k-9\geq 0 \wedge k\geq0\\ D:k\geq 9 \wedge k\geq0\\ D:k\geq 9\\ √(k-9)-\sqrt k=-1\\ √(k-9)=-1+\sqrt k\\ k-9=(-1+\sqrt k)^2\\ k-9=1-2\sqrt k+k\\ 2\sqrt k=10\\ \sqrt k =5\\ k=25`