-4.9t^2+23t+5=0

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Solution for -4.9t^2+23t+5=0 equation:


Simplifying
-4.9t2 + 23t + 5 = 0

Reorder the terms:
5 + 23t + -4.9t2 = 0

Solving
5 + 23t + -4.9t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
-1.020408163 + -4.693877551t + t2 = 0

Move the constant term to the right:

Add '1.020408163' to each side of the equation.
-1.020408163 + -4.693877551t + 1.020408163 + t2 = 0 + 1.020408163

Reorder the terms:
-1.020408163 + 1.020408163 + -4.693877551t + t2 = 0 + 1.020408163

Combine like terms: -1.020408163 + 1.020408163 = 0.000000000
0.000000000 + -4.693877551t + t2 = 0 + 1.020408163
-4.693877551t + t2 = 0 + 1.020408163

Combine like terms: 0 + 1.020408163 = 1.020408163
-4.693877551t + t2 = 1.020408163

The t term is -4.693877551t.  Take half its coefficient (-2.346938776).
Square it (5.508121618) and add it to both sides.

Add '5.508121618' to each side of the equation.
-4.693877551t + 5.508121618 + t2 = 1.020408163 + 5.508121618

Reorder the terms:
5.508121618 + -4.693877551t + t2 = 1.020408163 + 5.508121618

Combine like terms: 1.020408163 + 5.508121618 = 6.528529781
5.508121618 + -4.693877551t + t2 = 6.528529781

Factor a perfect square on the left side:
(t + -2.346938776)(t + -2.346938776) = 6.528529781

Calculate the square root of the right side: 2.555098781

Break this problem into two subproblems by setting 
(t + -2.346938776) equal to 2.555098781 and -2.555098781.

Subproblem 1

t + -2.346938776 = 2.555098781 Simplifying t + -2.346938776 = 2.555098781 Reorder the terms: -2.346938776 + t = 2.555098781 Solving -2.346938776 + t = 2.555098781 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.346938776' to each side of the equation. -2.346938776 + 2.346938776 + t = 2.555098781 + 2.346938776 Combine like terms: -2.346938776 + 2.346938776 = 0.000000000 0.000000000 + t = 2.555098781 + 2.346938776 t = 2.555098781 + 2.346938776 Combine like terms: 2.555098781 + 2.346938776 = 4.902037557 t = 4.902037557 Simplifying t = 4.902037557

Subproblem 2

t + -2.346938776 = -2.555098781 Simplifying t + -2.346938776 = -2.555098781 Reorder the terms: -2.346938776 + t = -2.555098781 Solving -2.346938776 + t = -2.555098781 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.346938776' to each side of the equation. -2.346938776 + 2.346938776 + t = -2.555098781 + 2.346938776 Combine like terms: -2.346938776 + 2.346938776 = 0.000000000 0.000000000 + t = -2.555098781 + 2.346938776 t = -2.555098781 + 2.346938776 Combine like terms: -2.555098781 + 2.346938776 = -0.208160005 t = -0.208160005 Simplifying t = -0.208160005

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.902037557, -0.208160005}

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