11=-4.9t^2+120t

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Solution for 11=-4.9t^2+120t equation:


Simplifying
11 = -4.9t2 + 120t

Reorder the terms:
11 = 120t + -4.9t2

Solving
11 = 120t + -4.9t2

Solving for variable 't'.

Reorder the terms:
11 + -120t + 4.9t2 = 120t + -120t + -4.9t2 + 4.9t2

Combine like terms: 120t + -120t = 0
11 + -120t + 4.9t2 = 0 + -4.9t2 + 4.9t2
11 + -120t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
11 + -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'.
2.244897959 + -24.48979592t + t2 = 0

Move the constant term to the right:

Add '-2.244897959' to each side of the equation.
2.244897959 + -24.48979592t + -2.244897959 + t2 = 0 + -2.244897959

Reorder the terms:
2.244897959 + -2.244897959 + -24.48979592t + t2 = 0 + -2.244897959

Combine like terms: 2.244897959 + -2.244897959 = 0.000000000
0.000000000 + -24.48979592t + t2 = 0 + -2.244897959
-24.48979592t + t2 = 0 + -2.244897959

Combine like terms: 0 + -2.244897959 = -2.244897959
-24.48979592t + t2 = -2.244897959

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 = -2.244897959 + 149.9375261

Reorder the terms:
149.9375261 + -24.48979592t + t2 = -2.244897959 + 149.9375261

Combine like terms: -2.244897959 + 149.9375261 = 147.692628141
149.9375261 + -24.48979592t + t2 = 147.692628141

Factor a perfect square on the left side:
(t + -12.24489796)(t + -12.24489796) = 147.692628141

Calculate the square root of the right side: 12.152885589

Break this problem into two subproblems by setting 
(t + -12.24489796) equal to 12.152885589 and -12.152885589.

Subproblem 1

t + -12.24489796 = 12.152885589 Simplifying t + -12.24489796 = 12.152885589 Reorder the terms: -12.24489796 + t = 12.152885589 Solving -12.24489796 + t = 12.152885589 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 = 12.152885589 + 12.24489796 Combine like terms: -12.24489796 + 12.24489796 = 0.00000000 0.00000000 + t = 12.152885589 + 12.24489796 t = 12.152885589 + 12.24489796 Combine like terms: 12.152885589 + 12.24489796 = 24.397783549 t = 24.397783549 Simplifying t = 24.397783549

Subproblem 2

t + -12.24489796 = -12.152885589 Simplifying t + -12.24489796 = -12.152885589 Reorder the terms: -12.24489796 + t = -12.152885589 Solving -12.24489796 + t = -12.152885589 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 = -12.152885589 + 12.24489796 Combine like terms: -12.24489796 + 12.24489796 = 0.00000000 0.00000000 + t = -12.152885589 + 12.24489796 t = -12.152885589 + 12.24489796 Combine like terms: -12.152885589 + 12.24489796 = 0.092012371 t = 0.092012371 Simplifying t = 0.092012371

Solution

The solution to the problem is based on the solutions from the subproblems. t = {24.397783549, 0.092012371}

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