0=125+5.2t-4.9t^2

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Solution for 0=125+5.2t-4.9t^2 equation:


Simplifying
0 = 125 + 5.2t + -4.9t2

Solving
0 = 125 + 5.2t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -125 = -125
-125 + -5.2t + 4.9t2 = 125 + 5.2t + -4.9t2 + -125 + -5.2t + 4.9t2

Reorder the terms:
-125 + -5.2t + 4.9t2 = 125 + -125 + 5.2t + -5.2t + -4.9t2 + 4.9t2

Combine like terms: 125 + -125 = 0
-125 + -5.2t + 4.9t2 = 0 + 5.2t + -5.2t + -4.9t2 + 4.9t2
-125 + -5.2t + 4.9t2 = 5.2t + -5.2t + -4.9t2 + 4.9t2

Combine like terms: 5.2t + -5.2t = 0.0
-125 + -5.2t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-125 + -5.2t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-125 + -5.2t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
-25.51020408 + -1.06122449t + t2 = 0

Move the constant term to the right:

Add '25.51020408' to each side of the equation.
-25.51020408 + -1.06122449t + 25.51020408 + t2 = 0 + 25.51020408

Reorder the terms:
-25.51020408 + 25.51020408 + -1.06122449t + t2 = 0 + 25.51020408

Combine like terms: -25.51020408 + 25.51020408 = 0.00000000
0.00000000 + -1.06122449t + t2 = 0 + 25.51020408
-1.06122449t + t2 = 0 + 25.51020408

Combine like terms: 0 + 25.51020408 = 25.51020408
-1.06122449t + t2 = 25.51020408

The t term is -1.06122449t.  Take half its coefficient (-0.530612245).
Square it (0.2815493545) and add it to both sides.

Add '0.2815493545' to each side of the equation.
-1.06122449t + 0.2815493545 + t2 = 25.51020408 + 0.2815493545

Reorder the terms:
0.2815493545 + -1.06122449t + t2 = 25.51020408 + 0.2815493545

Combine like terms: 25.51020408 + 0.2815493545 = 25.7917534345
0.2815493545 + -1.06122449t + t2 = 25.7917534345

Factor a perfect square on the left side:
(t + -0.530612245)(t + -0.530612245) = 25.7917534345

Calculate the square root of the right side: 5.078558204

Break this problem into two subproblems by setting 
(t + -0.530612245) equal to 5.078558204 and -5.078558204.

Subproblem 1

t + -0.530612245 = 5.078558204 Simplifying t + -0.530612245 = 5.078558204 Reorder the terms: -0.530612245 + t = 5.078558204 Solving -0.530612245 + t = 5.078558204 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.530612245' to each side of the equation. -0.530612245 + 0.530612245 + t = 5.078558204 + 0.530612245 Combine like terms: -0.530612245 + 0.530612245 = 0.000000000 0.000000000 + t = 5.078558204 + 0.530612245 t = 5.078558204 + 0.530612245 Combine like terms: 5.078558204 + 0.530612245 = 5.609170449 t = 5.609170449 Simplifying t = 5.609170449

Subproblem 2

t + -0.530612245 = -5.078558204 Simplifying t + -0.530612245 = -5.078558204 Reorder the terms: -0.530612245 + t = -5.078558204 Solving -0.530612245 + t = -5.078558204 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.530612245' to each side of the equation. -0.530612245 + 0.530612245 + t = -5.078558204 + 0.530612245 Combine like terms: -0.530612245 + 0.530612245 = 0.000000000 0.000000000 + t = -5.078558204 + 0.530612245 t = -5.078558204 + 0.530612245 Combine like terms: -5.078558204 + 0.530612245 = -4.547945959 t = -4.547945959 Simplifying t = -4.547945959

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.609170449, -4.547945959}

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