6=12-5t-4.9t^2

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Solution for 6=12-5t-4.9t^2 equation:


Simplifying
6 = 12 + -5t + -4.9t2

Solving
6 = 12 + -5t + -4.9t2

Solving for variable 't'.

Combine like terms: 6 + -12 = -6
-6 + 5t + 4.9t2 = 12 + -5t + -4.9t2 + -12 + 5t + 4.9t2

Reorder the terms:
-6 + 5t + 4.9t2 = 12 + -12 + -5t + 5t + -4.9t2 + 4.9t2

Combine like terms: 12 + -12 = 0
-6 + 5t + 4.9t2 = 0 + -5t + 5t + -4.9t2 + 4.9t2
-6 + 5t + 4.9t2 = -5t + 5t + -4.9t2 + 4.9t2

Combine like terms: -5t + 5t = 0
-6 + 5t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-6 + 5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-6 + 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'.
-1.224489796 + 1.020408163t + t2 = 0

Move the constant term to the right:

Add '1.224489796' to each side of the equation.
-1.224489796 + 1.020408163t + 1.224489796 + t2 = 0 + 1.224489796

Reorder the terms:
-1.224489796 + 1.224489796 + 1.020408163t + t2 = 0 + 1.224489796

Combine like terms: -1.224489796 + 1.224489796 = 0.000000000
0.000000000 + 1.020408163t + t2 = 0 + 1.224489796
1.020408163t + t2 = 0 + 1.224489796

Combine like terms: 0 + 1.224489796 = 1.224489796
1.020408163t + t2 = 1.224489796

The t term is 1.020408163t.  Take half its coefficient (0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
1.020408163t + 0.2603082048 + t2 = 1.224489796 + 0.2603082048

Reorder the terms:
0.2603082048 + 1.020408163t + t2 = 1.224489796 + 0.2603082048

Combine like terms: 1.224489796 + 0.2603082048 = 1.4847980008
0.2603082048 + 1.020408163t + t2 = 1.4847980008

Factor a perfect square on the left side:
(t + 0.5102040815)(t + 0.5102040815) = 1.4847980008

Calculate the square root of the right side: 1.218522877

Break this problem into two subproblems by setting 
(t + 0.5102040815) equal to 1.218522877 and -1.218522877.

Subproblem 1

t + 0.5102040815 = 1.218522877 Simplifying t + 0.5102040815 = 1.218522877 Reorder the terms: 0.5102040815 + t = 1.218522877 Solving 0.5102040815 + t = 1.218522877 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5102040815' to each side of the equation. 0.5102040815 + -0.5102040815 + t = 1.218522877 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + t = 1.218522877 + -0.5102040815 t = 1.218522877 + -0.5102040815 Combine like terms: 1.218522877 + -0.5102040815 = 0.7083187955 t = 0.7083187955 Simplifying t = 0.7083187955

Subproblem 2

t + 0.5102040815 = -1.218522877 Simplifying t + 0.5102040815 = -1.218522877 Reorder the terms: 0.5102040815 + t = -1.218522877 Solving 0.5102040815 + t = -1.218522877 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5102040815' to each side of the equation. 0.5102040815 + -0.5102040815 + t = -1.218522877 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + t = -1.218522877 + -0.5102040815 t = -1.218522877 + -0.5102040815 Combine like terms: -1.218522877 + -0.5102040815 = -1.7287269585 t = -1.7287269585 Simplifying t = -1.7287269585

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.7083187955, -1.7287269585}

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