0.1t^2+20t+660=0

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Solution for 0.1t^2+20t+660=0 equation:


Simplifying
0.1t2 + 20t + 660 = 0

Reorder the terms:
660 + 20t + 0.1t2 = 0

Solving
660 + 20t + 0.1t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
0.1 the coefficient of the squared term: 

Divide each side by '0.1'.
6600 + 200t + t2 = 0

Move the constant term to the right:

Add '-6600' to each side of the equation.
6600 + 200t + -6600 + t2 = 0 + -6600

Reorder the terms:
6600 + -6600 + 200t + t2 = 0 + -6600

Combine like terms: 6600 + -6600 = 0
0 + 200t + t2 = 0 + -6600
200t + t2 = 0 + -6600

Combine like terms: 0 + -6600 = -6600
200t + t2 = -6600

The t term is 200t.  Take half its coefficient (100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
200t + 10000 + t2 = -6600 + 10000

Reorder the terms:
10000 + 200t + t2 = -6600 + 10000

Combine like terms: -6600 + 10000 = 3400
10000 + 200t + t2 = 3400

Factor a perfect square on the left side:
(t + 100)(t + 100) = 3400

Calculate the square root of the right side: 58.309518948

Break this problem into two subproblems by setting 
(t + 100) equal to 58.309518948 and -58.309518948.

Subproblem 1

t + 100 = 58.309518948 Simplifying t + 100 = 58.309518948 Reorder the terms: 100 + t = 58.309518948 Solving 100 + t = 58.309518948 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + t = 58.309518948 + -100 Combine like terms: 100 + -100 = 0 0 + t = 58.309518948 + -100 t = 58.309518948 + -100 Combine like terms: 58.309518948 + -100 = -41.690481052 t = -41.690481052 Simplifying t = -41.690481052

Subproblem 2

t + 100 = -58.309518948 Simplifying t + 100 = -58.309518948 Reorder the terms: 100 + t = -58.309518948 Solving 100 + t = -58.309518948 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + t = -58.309518948 + -100 Combine like terms: 100 + -100 = 0 0 + t = -58.309518948 + -100 t = -58.309518948 + -100 Combine like terms: -58.309518948 + -100 = -158.309518948 t = -158.309518948 Simplifying t = -158.309518948

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-41.690481052, -158.309518948}

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