What is the equation for Marginal product of capital in economics?

The marginal product of capital (MPK) in economics is defined as the additional output generated by employing one more unit of capital while holding other inputs constant. It can be mathematically expressed as the partial derivative of the production function ( Q ) with respect to capital ( K ):

[ MPK = \frac{\partial Q}{\partial K} ]

This indicates how changes in the capital input affect the overall production output.