5=10+4.9t-4.9t^2

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Solution for 5=10+4.9t-4.9t^2 equation:


Simplifying
5 = 10 + 4.9t + -4.9t2

Solving
5 = 10 + 4.9t + -4.9t2

Solving for variable 't'.

Combine like terms: 5 + -10 = -5
-5 + -4.9t + 4.9t2 = 10 + 4.9t + -4.9t2 + -10 + -4.9t + 4.9t2

Reorder the terms:
-5 + -4.9t + 4.9t2 = 10 + -10 + 4.9t + -4.9t + -4.9t2 + 4.9t2

Combine like terms: 10 + -10 = 0
-5 + -4.9t + 4.9t2 = 0 + 4.9t + -4.9t + -4.9t2 + 4.9t2
-5 + -4.9t + 4.9t2 = 4.9t + -4.9t + -4.9t2 + 4.9t2

Combine like terms: 4.9t + -4.9t = 0.0
-5 + -4.9t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-5 + -4.9t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-5 + -4.9t + 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 + -1t + t2 = 0

Move the constant term to the right:

Add '1.020408163' to each side of the equation.
-1.020408163 + -1t + 1.020408163 + t2 = 0 + 1.020408163

Reorder the terms:
-1.020408163 + 1.020408163 + -1t + t2 = 0 + 1.020408163

Combine like terms: -1.020408163 + 1.020408163 = 0.000000000
0.000000000 + -1t + t2 = 0 + 1.020408163
-1t + t2 = 0 + 1.020408163

Combine like terms: 0 + 1.020408163 = 1.020408163
-1t + t2 = 1.020408163

The t term is -1t.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1t + 0.25 + t2 = 1.020408163 + 0.25

Reorder the terms:
0.25 + -1t + t2 = 1.020408163 + 0.25

Combine like terms: 1.020408163 + 0.25 = 1.270408163
0.25 + -1t + t2 = 1.270408163

Factor a perfect square on the left side:
(t + -0.5)(t + -0.5) = 1.270408163

Calculate the square root of the right side: 1.127123845

Break this problem into two subproblems by setting 
(t + -0.5) equal to 1.127123845 and -1.127123845.

Subproblem 1

t + -0.5 = 1.127123845 Simplifying t + -0.5 = 1.127123845 Reorder the terms: -0.5 + t = 1.127123845 Solving -0.5 + t = 1.127123845 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + t = 1.127123845 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + t = 1.127123845 + 0.5 t = 1.127123845 + 0.5 Combine like terms: 1.127123845 + 0.5 = 1.627123845 t = 1.627123845 Simplifying t = 1.627123845

Subproblem 2

t + -0.5 = -1.127123845 Simplifying t + -0.5 = -1.127123845 Reorder the terms: -0.5 + t = -1.127123845 Solving -0.5 + t = -1.127123845 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + t = -1.127123845 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + t = -1.127123845 + 0.5 t = -1.127123845 + 0.5 Combine like terms: -1.127123845 + 0.5 = -0.627123845 t = -0.627123845 Simplifying t = -0.627123845

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.627123845, -0.627123845}

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