0=-5.2t^2+15t+8

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Solution for 0=-5.2t^2+15t+8 equation:


Simplifying
0 = -5.2t2 + 15t + 8

Reorder the terms:
0 = 8 + 15t + -5.2t2

Solving
0 = 8 + 15t + -5.2t2

Solving for variable 't'.

Combine like terms: 0 + -8 = -8
-8 + -15t + 5.2t2 = 8 + 15t + -5.2t2 + -8 + -15t + 5.2t2

Reorder the terms:
-8 + -15t + 5.2t2 = 8 + -8 + 15t + -15t + -5.2t2 + 5.2t2

Combine like terms: 8 + -8 = 0
-8 + -15t + 5.2t2 = 0 + 15t + -15t + -5.2t2 + 5.2t2
-8 + -15t + 5.2t2 = 15t + -15t + -5.2t2 + 5.2t2

Combine like terms: 15t + -15t = 0
-8 + -15t + 5.2t2 = 0 + -5.2t2 + 5.2t2
-8 + -15t + 5.2t2 = -5.2t2 + 5.2t2

Combine like terms: -5.2t2 + 5.2t2 = 0.0
-8 + -15t + 5.2t2 = 0.0

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

Divide each side by '5.2'.
-1.538461538 + -2.884615385t + t2 = 0

Move the constant term to the right:

Add '1.538461538' to each side of the equation.
-1.538461538 + -2.884615385t + 1.538461538 + t2 = 0 + 1.538461538

Reorder the terms:
-1.538461538 + 1.538461538 + -2.884615385t + t2 = 0 + 1.538461538

Combine like terms: -1.538461538 + 1.538461538 = 0.000000000
0.000000000 + -2.884615385t + t2 = 0 + 1.538461538
-2.884615385t + t2 = 0 + 1.538461538

Combine like terms: 0 + 1.538461538 = 1.538461538
-2.884615385t + t2 = 1.538461538

The t term is -2.884615385t.  Take half its coefficient (-1.442307693).
Square it (2.080251481) and add it to both sides.

Add '2.080251481' to each side of the equation.
-2.884615385t + 2.080251481 + t2 = 1.538461538 + 2.080251481

Reorder the terms:
2.080251481 + -2.884615385t + t2 = 1.538461538 + 2.080251481

Combine like terms: 1.538461538 + 2.080251481 = 3.618713019
2.080251481 + -2.884615385t + t2 = 3.618713019

Factor a perfect square on the left side:
(t + -1.442307693)(t + -1.442307693) = 3.618713019

Calculate the square root of the right side: 1.902291518

Break this problem into two subproblems by setting 
(t + -1.442307693) equal to 1.902291518 and -1.902291518.

Subproblem 1

t + -1.442307693 = 1.902291518 Simplifying t + -1.442307693 = 1.902291518 Reorder the terms: -1.442307693 + t = 1.902291518 Solving -1.442307693 + t = 1.902291518 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.442307693' to each side of the equation. -1.442307693 + 1.442307693 + t = 1.902291518 + 1.442307693 Combine like terms: -1.442307693 + 1.442307693 = 0.000000000 0.000000000 + t = 1.902291518 + 1.442307693 t = 1.902291518 + 1.442307693 Combine like terms: 1.902291518 + 1.442307693 = 3.344599211 t = 3.344599211 Simplifying t = 3.344599211

Subproblem 2

t + -1.442307693 = -1.902291518 Simplifying t + -1.442307693 = -1.902291518 Reorder the terms: -1.442307693 + t = -1.902291518 Solving -1.442307693 + t = -1.902291518 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.442307693' to each side of the equation. -1.442307693 + 1.442307693 + t = -1.902291518 + 1.442307693 Combine like terms: -1.442307693 + 1.442307693 = 0.000000000 0.000000000 + t = -1.902291518 + 1.442307693 t = -1.902291518 + 1.442307693 Combine like terms: -1.902291518 + 1.442307693 = -0.459983825 t = -0.459983825 Simplifying t = -0.459983825

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.344599211, -0.459983825}

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