20=20-5t-5t^2

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Solution for 20=20-5t-5t^2 equation:


Simplifying
20 = 20 + -5t + -5t2

Add '-20' to each side of the equation.
20 + -20 = 20 + -5t + -20 + -5t2

Combine like terms: 20 + -20 = 0
0 = 20 + -5t + -20 + -5t2

Reorder the terms:
0 = 20 + -20 + -5t + -5t2

Combine like terms: 20 + -20 = 0
0 = 0 + -5t + -5t2
0 = -5t + -5t2

Solving
0 = -5t + -5t2

Solving for variable 't'.
Remove the zero:
5t + 5t2 = -5t + -5t2 + 5t + 5t2

Reorder the terms:
5t + 5t2 = -5t + 5t + -5t2 + 5t2

Combine like terms: -5t + 5t = 0
5t + 5t2 = 0 + -5t2 + 5t2
5t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
5t + 5t2 = 0

Factor out the Greatest Common Factor (GCF), '5t'.
5t(1 + t) = 0

Ignore the factor 5.

Subproblem 1

Set the factor 't' equal to zero and attempt to solve: Simplifying t = 0 Solving t = 0 Move all terms containing t to the left, all other terms to the right. Simplifying t = 0

Subproblem 2

Set the factor '(1 + t)' equal to zero and attempt to solve: Simplifying 1 + t = 0 Solving 1 + t = 0 Move all terms containing t to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + t = 0 + -1 Combine like terms: 1 + -1 = 0 0 + t = 0 + -1 t = 0 + -1 Combine like terms: 0 + -1 = -1 t = -1 Simplifying t = -1

Solution

t = {0, -1}

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