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

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


Simplifying
0 = -5t2 + 20t + 2

Reorder the terms:
0 = 2 + 20t + -5t2

Solving
0 = 2 + 20t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -2 = -2
-2 + -20t + 5t2 = 2 + 20t + -5t2 + -2 + -20t + 5t2

Reorder the terms:
-2 + -20t + 5t2 = 2 + -2 + 20t + -20t + -5t2 + 5t2

Combine like terms: 2 + -2 = 0
-2 + -20t + 5t2 = 0 + 20t + -20t + -5t2 + 5t2
-2 + -20t + 5t2 = 20t + -20t + -5t2 + 5t2

Combine like terms: 20t + -20t = 0
-2 + -20t + 5t2 = 0 + -5t2 + 5t2
-2 + -20t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 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'.
-0.4 + -4t + t2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -4t + 0.4 + t2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -4t + t2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -4t + t2 = 0 + 0.4
-4t + t2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-4t + t2 = 0.4

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 = 0.4 + 4

Reorder the terms:
4 + -4t + t2 = 0.4 + 4

Combine like terms: 0.4 + 4 = 4.4
4 + -4t + t2 = 4.4

Factor a perfect square on the left side:
(t + -2)(t + -2) = 4.4

Calculate the square root of the right side: 2.097617696

Break this problem into two subproblems by setting 
(t + -2) equal to 2.097617696 and -2.097617696.

Subproblem 1

t + -2 = 2.097617696 Simplifying t + -2 = 2.097617696 Reorder the terms: -2 + t = 2.097617696 Solving -2 + t = 2.097617696 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 = 2.097617696 + 2 Combine like terms: -2 + 2 = 0 0 + t = 2.097617696 + 2 t = 2.097617696 + 2 Combine like terms: 2.097617696 + 2 = 4.097617696 t = 4.097617696 Simplifying t = 4.097617696

Subproblem 2

t + -2 = -2.097617696 Simplifying t + -2 = -2.097617696 Reorder the terms: -2 + t = -2.097617696 Solving -2 + t = -2.097617696 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 = -2.097617696 + 2 Combine like terms: -2 + 2 = 0 0 + t = -2.097617696 + 2 t = -2.097617696 + 2 Combine like terms: -2.097617696 + 2 = -0.097617696 t = -0.097617696 Simplifying t = -0.097617696

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.097617696, -0.097617696}

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