0=-4.9t^2+6t+5

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Solution for 0=-4.9t^2+6t+5 equation:


Simplifying
0 = -4.9t2 + 6t + 5

Reorder the terms:
0 = 5 + 6t + -4.9t2

Solving
0 = 5 + 6t + -4.9t2

Solving for variable 't'.

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

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

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

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

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-5 + -6t + 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'.
-1.020408163 + -1.224489796t + t2 = 0

Move the constant term to the right:

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

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

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

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

The t term is -1.224489796t.  Take half its coefficient (-0.612244898).
Square it (0.3748438151) and add it to both sides.

Add '0.3748438151' to each side of the equation.
-1.224489796t + 0.3748438151 + t2 = 1.020408163 + 0.3748438151

Reorder the terms:
0.3748438151 + -1.224489796t + t2 = 1.020408163 + 0.3748438151

Combine like terms: 1.020408163 + 0.3748438151 = 1.3952519781
0.3748438151 + -1.224489796t + t2 = 1.3952519781

Factor a perfect square on the left side:
(t + -0.612244898)(t + -0.612244898) = 1.3952519781

Calculate the square root of the right side: 1.181207847

Break this problem into two subproblems by setting 
(t + -0.612244898) equal to 1.181207847 and -1.181207847.

Subproblem 1

t + -0.612244898 = 1.181207847 Simplifying t + -0.612244898 = 1.181207847 Reorder the terms: -0.612244898 + t = 1.181207847 Solving -0.612244898 + t = 1.181207847 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.612244898' to each side of the equation. -0.612244898 + 0.612244898 + t = 1.181207847 + 0.612244898 Combine like terms: -0.612244898 + 0.612244898 = 0.000000000 0.000000000 + t = 1.181207847 + 0.612244898 t = 1.181207847 + 0.612244898 Combine like terms: 1.181207847 + 0.612244898 = 1.793452745 t = 1.793452745 Simplifying t = 1.793452745

Subproblem 2

t + -0.612244898 = -1.181207847 Simplifying t + -0.612244898 = -1.181207847 Reorder the terms: -0.612244898 + t = -1.181207847 Solving -0.612244898 + t = -1.181207847 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.612244898' to each side of the equation. -0.612244898 + 0.612244898 + t = -1.181207847 + 0.612244898 Combine like terms: -0.612244898 + 0.612244898 = 0.000000000 0.000000000 + t = -1.181207847 + 0.612244898 t = -1.181207847 + 0.612244898 Combine like terms: -1.181207847 + 0.612244898 = -0.568962949 t = -0.568962949 Simplifying t = -0.568962949

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.793452745, -0.568962949}

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