(-2t-t^2)/(4-t)

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Solution for (-2t-t^2)/(4-t) equation: 


D( t )

4-t = 0

4-t = 0

4-t = 0

4-t = 0 // - 4

-t = -4 // * -1

t = 4

t in (-oo:4) U (4:+oo)

(-t^2-2*t)/(4-t) = 0

-t^2-2*t = 0

-t*(t+2) = 0

t+2 = 0 // - 2

t = -2

-t*(t+2) = 0

(-t*(t+2))/(4-t) = 0

( -t )

-1*t = 0 // : -1

t = 0

( t+2 )

t+2 = 0 // - 2

t = -2

t in { 0, -2 }

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