0=-5t^2+20t+1

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Solution for 0=-5t^2+20t+1 equation:


Simplifying
0 = -5t2 + 20t + 1

Reorder the terms:
0 = 1 + 20t + -5t2

Solving
0 = 1 + 20t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -1 = -1
-1 + -20t + 5t2 = 1 + 20t + -5t2 + -1 + -20t + 5t2

Reorder the terms:
-1 + -20t + 5t2 = 1 + -1 + 20t + -20t + -5t2 + 5t2

Combine like terms: 1 + -1 = 0
-1 + -20t + 5t2 = 0 + 20t + -20t + -5t2 + 5t2
-1 + -20t + 5t2 = 20t + -20t + -5t2 + 5t2

Combine like terms: 20t + -20t = 0
-1 + -20t + 5t2 = 0 + -5t2 + 5t2
-1 + -20t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-1 + -20t + 5t2 = 0

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

Divide each side by '5'.
-0.2 + -4t + t2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -4t + 0.2 + t2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -4t + t2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -4t + t2 = 0 + 0.2
-4t + t2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-4t + t2 = 0.2

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 = 0.2 + 4

Reorder the terms:
4 + -4t + t2 = 0.2 + 4

Combine like terms: 0.2 + 4 = 4.2
4 + -4t + t2 = 4.2

Factor a perfect square on the left side:
(t + -2)(t + -2) = 4.2

Calculate the square root of the right side: 2.049390153

Break this problem into two subproblems by setting 
(t + -2) equal to 2.049390153 and -2.049390153.

Subproblem 1

t + -2 = 2.049390153 Simplifying t + -2 = 2.049390153 Reorder the terms: -2 + t = 2.049390153 Solving -2 + t = 2.049390153 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 = 2.049390153 + 2 Combine like terms: -2 + 2 = 0 0 + t = 2.049390153 + 2 t = 2.049390153 + 2 Combine like terms: 2.049390153 + 2 = 4.049390153 t = 4.049390153 Simplifying t = 4.049390153

Subproblem 2

t + -2 = -2.049390153 Simplifying t + -2 = -2.049390153 Reorder the terms: -2 + t = -2.049390153 Solving -2 + t = -2.049390153 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 = -2.049390153 + 2 Combine like terms: -2 + 2 = 0 0 + t = -2.049390153 + 2 t = -2.049390153 + 2 Combine like terms: -2.049390153 + 2 = -0.049390153 t = -0.049390153 Simplifying t = -0.049390153

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.049390153, -0.049390153}

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