12=-4.9t^2+120t

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Solution for 12=-4.9t^2+120t equation:


Simplifying
12 = -4.9t2 + 120t

Reorder the terms:
12 = 120t + -4.9t2

Solving
12 = 120t + -4.9t2

Solving for variable 't'.

Reorder the terms:
12 + -120t + 4.9t2 = 120t + -120t + -4.9t2 + 4.9t2

Combine like terms: 120t + -120t = 0
12 + -120t + 4.9t2 = 0 + -4.9t2 + 4.9t2
12 + -120t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
12 + -120t + 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'.
2.448979592 + -24.48979592t + t2 = 0

Move the constant term to the right:

Add '-2.448979592' to each side of the equation.
2.448979592 + -24.48979592t + -2.448979592 + t2 = 0 + -2.448979592

Reorder the terms:
2.448979592 + -2.448979592 + -24.48979592t + t2 = 0 + -2.448979592

Combine like terms: 2.448979592 + -2.448979592 = 0.000000000
0.000000000 + -24.48979592t + t2 = 0 + -2.448979592
-24.48979592t + t2 = 0 + -2.448979592

Combine like terms: 0 + -2.448979592 = -2.448979592
-24.48979592t + t2 = -2.448979592

The t term is -24.48979592t.  Take half its coefficient (-12.24489796).
Square it (149.9375261) and add it to both sides.

Add '149.9375261' to each side of the equation.
-24.48979592t + 149.9375261 + t2 = -2.448979592 + 149.9375261

Reorder the terms:
149.9375261 + -24.48979592t + t2 = -2.448979592 + 149.9375261

Combine like terms: -2.448979592 + 149.9375261 = 147.488546508
149.9375261 + -24.48979592t + t2 = 147.488546508

Factor a perfect square on the left side:
(t + -12.24489796)(t + -12.24489796) = 147.488546508

Calculate the square root of the right side: 12.14448626

Break this problem into two subproblems by setting 
(t + -12.24489796) equal to 12.14448626 and -12.14448626.

Subproblem 1

t + -12.24489796 = 12.14448626 Simplifying t + -12.24489796 = 12.14448626 Reorder the terms: -12.24489796 + t = 12.14448626 Solving -12.24489796 + t = 12.14448626 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '12.24489796' to each side of the equation. -12.24489796 + 12.24489796 + t = 12.14448626 + 12.24489796 Combine like terms: -12.24489796 + 12.24489796 = 0.00000000 0.00000000 + t = 12.14448626 + 12.24489796 t = 12.14448626 + 12.24489796 Combine like terms: 12.14448626 + 12.24489796 = 24.38938422 t = 24.38938422 Simplifying t = 24.38938422

Subproblem 2

t + -12.24489796 = -12.14448626 Simplifying t + -12.24489796 = -12.14448626 Reorder the terms: -12.24489796 + t = -12.14448626 Solving -12.24489796 + t = -12.14448626 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '12.24489796' to each side of the equation. -12.24489796 + 12.24489796 + t = -12.14448626 + 12.24489796 Combine like terms: -12.24489796 + 12.24489796 = 0.00000000 0.00000000 + t = -12.14448626 + 12.24489796 t = -12.14448626 + 12.24489796 Combine like terms: -12.14448626 + 12.24489796 = 0.1004117 t = 0.1004117 Simplifying t = 0.1004117

Solution

The solution to the problem is based on the solutions from the subproblems. t = {24.38938422, 0.1004117}

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