0=-4.9t^2+8t+120

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Solution for 0=-4.9t^2+8t+120 equation:


Simplifying
0 = -4.9t2 + 8t + 120

Reorder the terms:
0 = 120 + 8t + -4.9t2

Solving
0 = 120 + 8t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -120 = -120
-120 + -8t + 4.9t2 = 120 + 8t + -4.9t2 + -120 + -8t + 4.9t2

Reorder the terms:
-120 + -8t + 4.9t2 = 120 + -120 + 8t + -8t + -4.9t2 + 4.9t2

Combine like terms: 120 + -120 = 0
-120 + -8t + 4.9t2 = 0 + 8t + -8t + -4.9t2 + 4.9t2
-120 + -8t + 4.9t2 = 8t + -8t + -4.9t2 + 4.9t2

Combine like terms: 8t + -8t = 0
-120 + -8t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-120 + -8t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-120 + -8t + 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'.
-24.48979592 + -1.632653061t + t2 = 0

Move the constant term to the right:

Add '24.48979592' to each side of the equation.
-24.48979592 + -1.632653061t + 24.48979592 + t2 = 0 + 24.48979592

Reorder the terms:
-24.48979592 + 24.48979592 + -1.632653061t + t2 = 0 + 24.48979592

Combine like terms: -24.48979592 + 24.48979592 = 0.00000000
0.00000000 + -1.632653061t + t2 = 0 + 24.48979592
-1.632653061t + t2 = 0 + 24.48979592

Combine like terms: 0 + 24.48979592 = 24.48979592
-1.632653061t + t2 = 24.48979592

The t term is -1.632653061t.  Take half its coefficient (-0.8163265305).
Square it (0.6663890044) and add it to both sides.

Add '0.6663890044' to each side of the equation.
-1.632653061t + 0.6663890044 + t2 = 24.48979592 + 0.6663890044

Reorder the terms:
0.6663890044 + -1.632653061t + t2 = 24.48979592 + 0.6663890044

Combine like terms: 24.48979592 + 0.6663890044 = 25.1561849244
0.6663890044 + -1.632653061t + t2 = 25.1561849244

Factor a perfect square on the left side:
(t + -0.8163265305)(t + -0.8163265305) = 25.1561849244

Calculate the square root of the right side: 5.015594175

Break this problem into two subproblems by setting 
(t + -0.8163265305) equal to 5.015594175 and -5.015594175.

Subproblem 1

t + -0.8163265305 = 5.015594175 Simplifying t + -0.8163265305 = 5.015594175 Reorder the terms: -0.8163265305 + t = 5.015594175 Solving -0.8163265305 + t = 5.015594175 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + t = 5.015594175 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + t = 5.015594175 + 0.8163265305 t = 5.015594175 + 0.8163265305 Combine like terms: 5.015594175 + 0.8163265305 = 5.8319207055 t = 5.8319207055 Simplifying t = 5.8319207055

Subproblem 2

t + -0.8163265305 = -5.015594175 Simplifying t + -0.8163265305 = -5.015594175 Reorder the terms: -0.8163265305 + t = -5.015594175 Solving -0.8163265305 + t = -5.015594175 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + t = -5.015594175 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + t = -5.015594175 + 0.8163265305 t = -5.015594175 + 0.8163265305 Combine like terms: -5.015594175 + 0.8163265305 = -4.1992676445 t = -4.1992676445 Simplifying t = -4.1992676445

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.8319207055, -4.1992676445}

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