0=75+15.5t-4.9t^2

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Solution for 0=75+15.5t-4.9t^2 equation:


Simplifying
0 = 75 + 15.5t + -4.9t2

Solving
0 = 75 + 15.5t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -75 = -75
-75 + -15.5t + 4.9t2 = 75 + 15.5t + -4.9t2 + -75 + -15.5t + 4.9t2

Reorder the terms:
-75 + -15.5t + 4.9t2 = 75 + -75 + 15.5t + -15.5t + -4.9t2 + 4.9t2

Combine like terms: 75 + -75 = 0
-75 + -15.5t + 4.9t2 = 0 + 15.5t + -15.5t + -4.9t2 + 4.9t2
-75 + -15.5t + 4.9t2 = 15.5t + -15.5t + -4.9t2 + 4.9t2

Combine like terms: 15.5t + -15.5t = 0.0
-75 + -15.5t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-75 + -15.5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-75 + -15.5t + 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'.
-15.30612245 + -3.163265306t + t2 = 0

Move the constant term to the right:

Add '15.30612245' to each side of the equation.
-15.30612245 + -3.163265306t + 15.30612245 + t2 = 0 + 15.30612245

Reorder the terms:
-15.30612245 + 15.30612245 + -3.163265306t + t2 = 0 + 15.30612245

Combine like terms: -15.30612245 + 15.30612245 = 0.00000000
0.00000000 + -3.163265306t + t2 = 0 + 15.30612245
-3.163265306t + t2 = 0 + 15.30612245

Combine like terms: 0 + 15.30612245 = 15.30612245
-3.163265306t + t2 = 15.30612245

The t term is -3.163265306t.  Take half its coefficient (-1.581632653).
Square it (2.501561849) and add it to both sides.

Add '2.501561849' to each side of the equation.
-3.163265306t + 2.501561849 + t2 = 15.30612245 + 2.501561849

Reorder the terms:
2.501561849 + -3.163265306t + t2 = 15.30612245 + 2.501561849

Combine like terms: 15.30612245 + 2.501561849 = 17.807684299
2.501561849 + -3.163265306t + t2 = 17.807684299

Factor a perfect square on the left side:
(t + -1.581632653)(t + -1.581632653) = 17.807684299

Calculate the square root of the right side: 4.2199152

Break this problem into two subproblems by setting 
(t + -1.581632653) equal to 4.2199152 and -4.2199152.

Subproblem 1

t + -1.581632653 = 4.2199152 Simplifying t + -1.581632653 = 4.2199152 Reorder the terms: -1.581632653 + t = 4.2199152 Solving -1.581632653 + t = 4.2199152 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.581632653' to each side of the equation. -1.581632653 + 1.581632653 + t = 4.2199152 + 1.581632653 Combine like terms: -1.581632653 + 1.581632653 = 0.000000000 0.000000000 + t = 4.2199152 + 1.581632653 t = 4.2199152 + 1.581632653 Combine like terms: 4.2199152 + 1.581632653 = 5.801547853 t = 5.801547853 Simplifying t = 5.801547853

Subproblem 2

t + -1.581632653 = -4.2199152 Simplifying t + -1.581632653 = -4.2199152 Reorder the terms: -1.581632653 + t = -4.2199152 Solving -1.581632653 + t = -4.2199152 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.581632653' to each side of the equation. -1.581632653 + 1.581632653 + t = -4.2199152 + 1.581632653 Combine like terms: -1.581632653 + 1.581632653 = 0.000000000 0.000000000 + t = -4.2199152 + 1.581632653 t = -4.2199152 + 1.581632653 Combine like terms: -4.2199152 + 1.581632653 = -2.638282547 t = -2.638282547 Simplifying t = -2.638282547

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.801547853, -2.638282547}

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