381.35=158t-9.81t^2

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Solution for 381.35=158t-9.81t^2 equation:


Simplifying
381.35 = 158t + -9.81t2

Solving
381.35 = 158t + -9.81t2

Solving for variable 't'.

Reorder the terms:
381.35 + -158t + 9.81t2 = 158t + -158t + -9.81t2 + 9.81t2

Combine like terms: 158t + -158t = 0
381.35 + -158t + 9.81t2 = 0 + -9.81t2 + 9.81t2
381.35 + -158t + 9.81t2 = -9.81t2 + 9.81t2

Combine like terms: -9.81t2 + 9.81t2 = 0.00
381.35 + -158t + 9.81t2 = 0.00

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

Divide each side by '9.81'.
38.87359837 + -16.10601427t + t2 = 0

Move the constant term to the right:

Add '-38.87359837' to each side of the equation.
38.87359837 + -16.10601427t + -38.87359837 + t2 = 0 + -38.87359837

Reorder the terms:
38.87359837 + -38.87359837 + -16.10601427t + t2 = 0 + -38.87359837

Combine like terms: 38.87359837 + -38.87359837 = 0.00000000
0.00000000 + -16.10601427t + t2 = 0 + -38.87359837
-16.10601427t + t2 = 0 + -38.87359837

Combine like terms: 0 + -38.87359837 = -38.87359837
-16.10601427t + t2 = -38.87359837

The t term is -16.10601427t.  Take half its coefficient (-8.053007135).
Square it (64.85092392) and add it to both sides.

Add '64.85092392' to each side of the equation.
-16.10601427t + 64.85092392 + t2 = -38.87359837 + 64.85092392

Reorder the terms:
64.85092392 + -16.10601427t + t2 = -38.87359837 + 64.85092392

Combine like terms: -38.87359837 + 64.85092392 = 25.97732555
64.85092392 + -16.10601427t + t2 = 25.97732555

Factor a perfect square on the left side:
(t + -8.053007135)(t + -8.053007135) = 25.97732555

Calculate the square root of the right side: 5.096795616

Break this problem into two subproblems by setting 
(t + -8.053007135) equal to 5.096795616 and -5.096795616.

Subproblem 1

t + -8.053007135 = 5.096795616 Simplifying t + -8.053007135 = 5.096795616 Reorder the terms: -8.053007135 + t = 5.096795616 Solving -8.053007135 + t = 5.096795616 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '8.053007135' to each side of the equation. -8.053007135 + 8.053007135 + t = 5.096795616 + 8.053007135 Combine like terms: -8.053007135 + 8.053007135 = 0.000000000 0.000000000 + t = 5.096795616 + 8.053007135 t = 5.096795616 + 8.053007135 Combine like terms: 5.096795616 + 8.053007135 = 13.149802751 t = 13.149802751 Simplifying t = 13.149802751

Subproblem 2

t + -8.053007135 = -5.096795616 Simplifying t + -8.053007135 = -5.096795616 Reorder the terms: -8.053007135 + t = -5.096795616 Solving -8.053007135 + t = -5.096795616 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '8.053007135' to each side of the equation. -8.053007135 + 8.053007135 + t = -5.096795616 + 8.053007135 Combine like terms: -8.053007135 + 8.053007135 = 0.000000000 0.000000000 + t = -5.096795616 + 8.053007135 t = -5.096795616 + 8.053007135 Combine like terms: -5.096795616 + 8.053007135 = 2.956211519 t = 2.956211519 Simplifying t = 2.956211519

Solution

The solution to the problem is based on the solutions from the subproblems. t = {13.149802751, 2.956211519}

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