Sure, here’s how to solve for k:

To isolate k, we can square both sides of the equation:

Simplifying the left-hand side:

Subtracting 5 from both sides:

Dividing both sides by 2:

Taking the square root of both sides:

So the solutions for k are:

or

Note that we took the positive and negative square root because the original equation was an equation of a square root.