0.2t^2+20t-500=0

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Solution for 0.2t^2+20t-500=0 equation:


Simplifying
0.2t2 + 20t + -500 = 0

Reorder the terms:
-500 + 20t + 0.2t2 = 0

Solving
-500 + 20t + 0.2t2 = 0

Solving for variable 't'.

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

Divide each side by '0.2'.
-2500 + 100t + t2 = 0

Move the constant term to the right:

Add '2500' to each side of the equation.
-2500 + 100t + 2500 + t2 = 0 + 2500

Reorder the terms:
-2500 + 2500 + 100t + t2 = 0 + 2500

Combine like terms: -2500 + 2500 = 0
0 + 100t + t2 = 0 + 2500
100t + t2 = 0 + 2500

Combine like terms: 0 + 2500 = 2500
100t + t2 = 2500

The t term is 100t.  Take half its coefficient (50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
100t + 2500 + t2 = 2500 + 2500

Reorder the terms:
2500 + 100t + t2 = 2500 + 2500

Combine like terms: 2500 + 2500 = 5000
2500 + 100t + t2 = 5000

Factor a perfect square on the left side:
(t + 50)(t + 50) = 5000

Calculate the square root of the right side: 70.710678119

Break this problem into two subproblems by setting 
(t + 50) equal to 70.710678119 and -70.710678119.

Subproblem 1

t + 50 = 70.710678119 Simplifying t + 50 = 70.710678119 Reorder the terms: 50 + t = 70.710678119 Solving 50 + t = 70.710678119 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + t = 70.710678119 + -50 Combine like terms: 50 + -50 = 0 0 + t = 70.710678119 + -50 t = 70.710678119 + -50 Combine like terms: 70.710678119 + -50 = 20.710678119 t = 20.710678119 Simplifying t = 20.710678119

Subproblem 2

t + 50 = -70.710678119 Simplifying t + 50 = -70.710678119 Reorder the terms: 50 + t = -70.710678119 Solving 50 + t = -70.710678119 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + t = -70.710678119 + -50 Combine like terms: 50 + -50 = 0 0 + t = -70.710678119 + -50 t = -70.710678119 + -50 Combine like terms: -70.710678119 + -50 = -120.710678119 t = -120.710678119 Simplifying t = -120.710678119

Solution

The solution to the problem is based on the solutions from the subproblems. t = {20.710678119, -120.710678119}

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