What is expand e^{-xk}*xk-e^{-x(t-k)} ?

The solution to expand e^{-xk}*xk-e^{-x(t-k)} is ke^{-kx}x-e^{-xt+kx}

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expand e^{-xk}*xk-e^{-x(t-k)}

expand

e^{- x k} \cdot x k - e^{- x (t - k)}

k e^{- k x} x - e^{- x t + k x}

Solution steps

e^{- x k} x k - e^{- x (t - k)}

Expand

- x (t - k) : - x t + k x

= k e^{- k x} x - e^{k x - x t}

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What is expand e^{-xk}*xk-e^{-x(t-k)} ?
The solution to expand e^{-xk}*xk-e^{-x(t-k)} is ke^{-kx}x-e^{-xt+kx}