.2=20t+5t^2

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Solution for .2=20t+5t^2 equation:


Simplifying
0.2 = 20t + 5t2

Solving
0.2 = 20t + 5t2

Solving for variable 't'.

Reorder the terms:
0.2 + -20t + -5t2 = 20t + -20t + 5t2 + -5t2

Combine like terms: 20t + -20t = 0
0.2 + -20t + -5t2 = 0 + 5t2 + -5t2
0.2 + -20t + -5t2 = 5t2 + -5t2

Combine like terms: 5t2 + -5t2 = 0
0.2 + -20t + -5t2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.04 + 4t + t2 = 0

Move the constant term to the right:

Add '0.04' to each side of the equation.
-0.04 + 4t + 0.04 + t2 = 0 + 0.04

Reorder the terms:
-0.04 + 0.04 + 4t + t2 = 0 + 0.04

Combine like terms: -0.04 + 0.04 = 0.00
0.00 + 4t + t2 = 0 + 0.04
4t + t2 = 0 + 0.04

Combine like terms: 0 + 0.04 = 0.04
4t + t2 = 0.04

The t term is 4t.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4t + 4 + t2 = 0.04 + 4

Reorder the terms:
4 + 4t + t2 = 0.04 + 4

Combine like terms: 0.04 + 4 = 4.04
4 + 4t + t2 = 4.04

Factor a perfect square on the left side:
(t + 2)(t + 2) = 4.04

Calculate the square root of the right side: 2.009975124

Break this problem into two subproblems by setting 
(t + 2) equal to 2.009975124 and -2.009975124.

Subproblem 1

t + 2 = 2.009975124 Simplifying t + 2 = 2.009975124 Reorder the terms: 2 + t = 2.009975124 Solving 2 + t = 2.009975124 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + t = 2.009975124 + -2 Combine like terms: 2 + -2 = 0 0 + t = 2.009975124 + -2 t = 2.009975124 + -2 Combine like terms: 2.009975124 + -2 = 0.009975124 t = 0.009975124 Simplifying t = 0.009975124

Subproblem 2

t + 2 = -2.009975124 Simplifying t + 2 = -2.009975124 Reorder the terms: 2 + t = -2.009975124 Solving 2 + t = -2.009975124 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + t = -2.009975124 + -2 Combine like terms: 2 + -2 = 0 0 + t = -2.009975124 + -2 t = -2.009975124 + -2 Combine like terms: -2.009975124 + -2 = -4.009975124 t = -4.009975124 Simplifying t = -4.009975124

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.009975124, -4.009975124}

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