D(t)=-0.4t*0.4t+4t+5

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Solution for D(t)=-0.4t*0.4t+4t+5 equation: 


Simplifying
D(t) = -0.4t * 0.4t + 4t + 5

Multiply D * t
tD = -0.4t * 0.4t + 4t + 5

Reorder the terms for easier multiplication:
tD = -0.4 * 0.4t * t + 4t + 5

Multiply -0.4 * 0.4
tD = -0.16t * t + 4t + 5

Multiply t * t
tD = -0.16t2 + 4t + 5

Reorder the terms:
tD = 5 + 4t + -0.16t2

Solving
tD = 5 + 4t + -0.16t2

Solving for variable 't'.

Reorder the terms:
-5 + -4t + tD + 0.16t2 = 5 + 4t + -0.16t2 + -5 + -4t + 0.16t2

Reorder the terms:
-5 + -4t + tD + 0.16t2 = 5 + -5 + 4t + -4t + -0.16t2 + 0.16t2

Combine like terms: 5 + -5 = 0
-5 + -4t + tD + 0.16t2 = 0 + 4t + -4t + -0.16t2 + 0.16t2
-5 + -4t + tD + 0.16t2 = 4t + -4t + -0.16t2 + 0.16t2

Combine like terms: 4t + -4t = 0
-5 + -4t + tD + 0.16t2 = 0 + -0.16t2 + 0.16t2
-5 + -4t + tD + 0.16t2 = -0.16t2 + 0.16t2

Combine like terms: -0.16t2 + 0.16t2 = 0.00
-5 + -4t + tD + 0.16t2 = 0.00

The solution to this equation could not be determined.

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