What is expand e^{-t}+(-1-e^{-t})U(t-5) ?

The solution to expand e^{-t}+(-1-e^{-t})U(t-5) is e^{-t}-tU+5U-e^{-t}tU+5e^{-t}U

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expand e^{-t}+(-1-e^{-t})U(t-5)

expand

e^{- t} + (- 1 - e^{- t}) U (t - 5)

e^{- t} - t U + 5 U - e^{- t} t U + 5 e^{- t} U

Solution steps

e^{- t} + (- 1 - e^{- t}) U (t - 5)

= e^{- t} + U (- 1 - e^{- t}) (t - 5)

Expand

(- 1 - e^{- t}) U (t - 5) : - t U + 5 U - e^{- t} t U + 5 e^{- t} U

= e^{- t} - t U + 5 U - e^{- t} t U + 5 e^{- t} U

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(1250 - x) + (- \frac{5100}{( 0.02 x + 1 ) ^{2}})

What is expand e^{-t}+(-1-e^{-t})U(t-5) ?
The solution to expand e^{-t}+(-1-e^{-t})U(t-5) is e^{-t}-tU+5U-e^{-t}tU+5e^{-t}U