5t^2+20t+4=0

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Solution for 5t^2+20t+4=0 equation:


Simplifying
5t2 + 20t + 4 = 0

Reorder the terms:
4 + 20t + 5t2 = 0

Solving
4 + 20t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
0.8 + 4t + t2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 4t + -0.8 + t2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 4t + t2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 4t + t2 = 0 + -0.8
4t + t2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
4t + t2 = -0.8

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 = -0.8 + 4

Reorder the terms:
4 + 4t + t2 = -0.8 + 4

Combine like terms: -0.8 + 4 = 3.2
4 + 4t + t2 = 3.2

Factor a perfect square on the left side:
(t + 2)(t + 2) = 3.2

Calculate the square root of the right side: 1.788854382

Break this problem into two subproblems by setting 
(t + 2) equal to 1.788854382 and -1.788854382.

Subproblem 1

t + 2 = 1.788854382 Simplifying t + 2 = 1.788854382 Reorder the terms: 2 + t = 1.788854382 Solving 2 + t = 1.788854382 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 = 1.788854382 + -2 Combine like terms: 2 + -2 = 0 0 + t = 1.788854382 + -2 t = 1.788854382 + -2 Combine like terms: 1.788854382 + -2 = -0.211145618 t = -0.211145618 Simplifying t = -0.211145618

Subproblem 2

t + 2 = -1.788854382 Simplifying t + 2 = -1.788854382 Reorder the terms: 2 + t = -1.788854382 Solving 2 + t = -1.788854382 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 = -1.788854382 + -2 Combine like terms: 2 + -2 = 0 0 + t = -1.788854382 + -2 t = -1.788854382 + -2 Combine like terms: -1.788854382 + -2 = -3.788854382 t = -3.788854382 Simplifying t = -3.788854382

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.211145618, -3.788854382}

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