0=-4.9t^2+24.5t+8.9

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Solution for 0=-4.9t^2+24.5t+8.9 equation:


Simplifying
0 = -4.9t2 + 24.5t + 8.9

Reorder the terms:
0 = 8.9 + 24.5t + -4.9t2

Solving
0 = 8.9 + 24.5t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -8.9 = -8.9
-8.9 + -24.5t + 4.9t2 = 8.9 + 24.5t + -4.9t2 + -8.9 + -24.5t + 4.9t2

Reorder the terms:
-8.9 + -24.5t + 4.9t2 = 8.9 + -8.9 + 24.5t + -24.5t + -4.9t2 + 4.9t2

Combine like terms: 8.9 + -8.9 = 0.0
-8.9 + -24.5t + 4.9t2 = 0.0 + 24.5t + -24.5t + -4.9t2 + 4.9t2
-8.9 + -24.5t + 4.9t2 = 24.5t + -24.5t + -4.9t2 + 4.9t2

Combine like terms: 24.5t + -24.5t = 0.0
-8.9 + -24.5t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-8.9 + -24.5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-8.9 + -24.5t + 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'.
-1.816326531 + -5t + t2 = 0

Move the constant term to the right:

Add '1.816326531' to each side of the equation.
-1.816326531 + -5t + 1.816326531 + t2 = 0 + 1.816326531

Reorder the terms:
-1.816326531 + 1.816326531 + -5t + t2 = 0 + 1.816326531

Combine like terms: -1.816326531 + 1.816326531 = 0.000000000
0.000000000 + -5t + t2 = 0 + 1.816326531
-5t + t2 = 0 + 1.816326531

Combine like terms: 0 + 1.816326531 = 1.816326531
-5t + t2 = 1.816326531

The t term is -5t.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5t + 6.25 + t2 = 1.816326531 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 1.816326531 + 6.25

Combine like terms: 1.816326531 + 6.25 = 8.066326531
6.25 + -5t + t2 = 8.066326531

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 8.066326531

Calculate the square root of the right side: 2.840127908

Break this problem into two subproblems by setting 
(t + -2.5) equal to 2.840127908 and -2.840127908.

Subproblem 1

t + -2.5 = 2.840127908 Simplifying t + -2.5 = 2.840127908 Reorder the terms: -2.5 + t = 2.840127908 Solving -2.5 + t = 2.840127908 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = 2.840127908 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 2.840127908 + 2.5 t = 2.840127908 + 2.5 Combine like terms: 2.840127908 + 2.5 = 5.340127908 t = 5.340127908 Simplifying t = 5.340127908

Subproblem 2

t + -2.5 = -2.840127908 Simplifying t + -2.5 = -2.840127908 Reorder the terms: -2.5 + t = -2.840127908 Solving -2.5 + t = -2.840127908 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = -2.840127908 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -2.840127908 + 2.5 t = -2.840127908 + 2.5 Combine like terms: -2.840127908 + 2.5 = -0.340127908 t = -0.340127908 Simplifying t = -0.340127908

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.340127908, -0.340127908}

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