0=-2t^2+10t+5

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Solution for 0=-2t^2+10t+5 equation:


Simplifying
0 = -2t2 + 10t + 5

Reorder the terms:
0 = 5 + 10t + -2t2

Solving
0 = 5 + 10t + -2t2

Solving for variable 't'.

Combine like terms: 0 + -5 = -5
-5 + -10t + 2t2 = 5 + 10t + -2t2 + -5 + -10t + 2t2

Reorder the terms:
-5 + -10t + 2t2 = 5 + -5 + 10t + -10t + -2t2 + 2t2

Combine like terms: 5 + -5 = 0
-5 + -10t + 2t2 = 0 + 10t + -10t + -2t2 + 2t2
-5 + -10t + 2t2 = 10t + -10t + -2t2 + 2t2

Combine like terms: 10t + -10t = 0
-5 + -10t + 2t2 = 0 + -2t2 + 2t2
-5 + -10t + 2t2 = -2t2 + 2t2

Combine like terms: -2t2 + 2t2 = 0
-5 + -10t + 2t2 = 0

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

Divide each side by '2'.
-2.5 + -5t + t2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5t + 2.5 + t2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5t + t2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5t + t2 = 0 + 2.5
-5t + t2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5t + t2 = 2.5

The t term is -5t.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5t + 6.25 + t2 = 2.5 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 2.5 + 6.25

Combine like terms: 2.5 + 6.25 = 8.75
6.25 + -5t + t2 = 8.75

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(t + -2.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

t + -2.5 = 2.958039892 Simplifying t + -2.5 = 2.958039892 Reorder the terms: -2.5 + t = 2.958039892 Solving -2.5 + t = 2.958039892 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = 2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 2.958039892 + 2.5 t = 2.958039892 + 2.5 Combine like terms: 2.958039892 + 2.5 = 5.458039892 t = 5.458039892 Simplifying t = 5.458039892

Subproblem 2

t + -2.5 = -2.958039892 Simplifying t + -2.5 = -2.958039892 Reorder the terms: -2.5 + t = -2.958039892 Solving -2.5 + t = -2.958039892 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = -2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -2.958039892 + 2.5 t = -2.958039892 + 2.5 Combine like terms: -2.958039892 + 2.5 = -0.458039892 t = -0.458039892 Simplifying t = -0.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.458039892, -0.458039892}

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