4+23.5t-4.9t^2=0

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Solution for 4+23.5t-4.9t^2=0 equation:


Simplifying
4 + 23.5t + -4.9t2 = 0

Solving
4 + 23.5t + -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'.
-0.8163265306 + -4.795918367t + t2 = 0

Move the constant term to the right:

Add '0.8163265306' to each side of the equation.
-0.8163265306 + -4.795918367t + 0.8163265306 + t2 = 0 + 0.8163265306

Reorder the terms:
-0.8163265306 + 0.8163265306 + -4.795918367t + t2 = 0 + 0.8163265306

Combine like terms: -0.8163265306 + 0.8163265306 = 0.0000000000
0.0000000000 + -4.795918367t + t2 = 0 + 0.8163265306
-4.795918367t + t2 = 0 + 0.8163265306

Combine like terms: 0 + 0.8163265306 = 0.8163265306
-4.795918367t + t2 = 0.8163265306

The t term is -4.795918367t.  Take half its coefficient (-2.397959184).
Square it (5.750208248) and add it to both sides.

Add '5.750208248' to each side of the equation.
-4.795918367t + 5.750208248 + t2 = 0.8163265306 + 5.750208248

Reorder the terms:
5.750208248 + -4.795918367t + t2 = 0.8163265306 + 5.750208248

Combine like terms: 0.8163265306 + 5.750208248 = 6.5665347786
5.750208248 + -4.795918367t + t2 = 6.5665347786

Factor a perfect square on the left side:
(t + -2.397959184)(t + -2.397959184) = 6.5665347786

Calculate the square root of the right side: 2.562525079

Break this problem into two subproblems by setting 
(t + -2.397959184) equal to 2.562525079 and -2.562525079.

Subproblem 1

t + -2.397959184 = 2.562525079 Simplifying t + -2.397959184 = 2.562525079 Reorder the terms: -2.397959184 + t = 2.562525079 Solving -2.397959184 + t = 2.562525079 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.397959184' to each side of the equation. -2.397959184 + 2.397959184 + t = 2.562525079 + 2.397959184 Combine like terms: -2.397959184 + 2.397959184 = 0.000000000 0.000000000 + t = 2.562525079 + 2.397959184 t = 2.562525079 + 2.397959184 Combine like terms: 2.562525079 + 2.397959184 = 4.960484263 t = 4.960484263 Simplifying t = 4.960484263

Subproblem 2

t + -2.397959184 = -2.562525079 Simplifying t + -2.397959184 = -2.562525079 Reorder the terms: -2.397959184 + t = -2.562525079 Solving -2.397959184 + t = -2.562525079 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.397959184' to each side of the equation. -2.397959184 + 2.397959184 + t = -2.562525079 + 2.397959184 Combine like terms: -2.397959184 + 2.397959184 = 0.000000000 0.000000000 + t = -2.562525079 + 2.397959184 t = -2.562525079 + 2.397959184 Combine like terms: -2.562525079 + 2.397959184 = -0.164565895 t = -0.164565895 Simplifying t = -0.164565895

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.960484263, -0.164565895}

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