4.9t^2-20t+15=0

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Solution for 4.9t^2-20t+15=0 equation:


Simplifying
4.9t2 + -20t + 15 = 0

Reorder the terms:
15 + -20t + 4.9t2 = 0

Solving
15 + -20t + 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'.
3.06122449 + -4.081632653t + t2 = 0

Move the constant term to the right:

Add '-3.06122449' to each side of the equation.
3.06122449 + -4.081632653t + -3.06122449 + t2 = 0 + -3.06122449

Reorder the terms:
3.06122449 + -3.06122449 + -4.081632653t + t2 = 0 + -3.06122449

Combine like terms: 3.06122449 + -3.06122449 = 0.00000000
0.00000000 + -4.081632653t + t2 = 0 + -3.06122449
-4.081632653t + t2 = 0 + -3.06122449

Combine like terms: 0 + -3.06122449 = -3.06122449
-4.081632653t + t2 = -3.06122449

The t term is -4.081632653t.  Take half its coefficient (-2.040816327).
Square it (4.164931281) and add it to both sides.

Add '4.164931281' to each side of the equation.
-4.081632653t + 4.164931281 + t2 = -3.06122449 + 4.164931281

Reorder the terms:
4.164931281 + -4.081632653t + t2 = -3.06122449 + 4.164931281

Combine like terms: -3.06122449 + 4.164931281 = 1.103706791
4.164931281 + -4.081632653t + t2 = 1.103706791

Factor a perfect square on the left side:
(t + -2.040816327)(t + -2.040816327) = 1.103706791

Calculate the square root of the right side: 1.050574505

Break this problem into two subproblems by setting 
(t + -2.040816327) equal to 1.050574505 and -1.050574505.

Subproblem 1

t + -2.040816327 = 1.050574505 Simplifying t + -2.040816327 = 1.050574505 Reorder the terms: -2.040816327 + t = 1.050574505 Solving -2.040816327 + t = 1.050574505 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.040816327' to each side of the equation. -2.040816327 + 2.040816327 + t = 1.050574505 + 2.040816327 Combine like terms: -2.040816327 + 2.040816327 = 0.000000000 0.000000000 + t = 1.050574505 + 2.040816327 t = 1.050574505 + 2.040816327 Combine like terms: 1.050574505 + 2.040816327 = 3.091390832 t = 3.091390832 Simplifying t = 3.091390832

Subproblem 2

t + -2.040816327 = -1.050574505 Simplifying t + -2.040816327 = -1.050574505 Reorder the terms: -2.040816327 + t = -1.050574505 Solving -2.040816327 + t = -1.050574505 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.040816327' to each side of the equation. -2.040816327 + 2.040816327 + t = -1.050574505 + 2.040816327 Combine like terms: -2.040816327 + 2.040816327 = 0.000000000 0.000000000 + t = -1.050574505 + 2.040816327 t = -1.050574505 + 2.040816327 Combine like terms: -1.050574505 + 2.040816327 = 0.990241822 t = 0.990241822 Simplifying t = 0.990241822

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.091390832, 0.990241822}

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