4.9t^2+20t-12=0

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Solution for 4.9t^2+20t-12=0 equation:


Simplifying
4.9t2 + 20t + -12 = 0

Reorder the terms:
-12 + 20t + 4.9t2 = 0

Solving
-12 + 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'.
-2.448979592 + 4.081632653t + t2 = 0

Move the constant term to the right:

Add '2.448979592' to each side of the equation.
-2.448979592 + 4.081632653t + 2.448979592 + t2 = 0 + 2.448979592

Reorder the terms:
-2.448979592 + 2.448979592 + 4.081632653t + t2 = 0 + 2.448979592

Combine like terms: -2.448979592 + 2.448979592 = 0.000000000
0.000000000 + 4.081632653t + t2 = 0 + 2.448979592
4.081632653t + t2 = 0 + 2.448979592

Combine like terms: 0 + 2.448979592 = 2.448979592
4.081632653t + t2 = 2.448979592

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 = 2.448979592 + 4.164931281

Reorder the terms:
4.164931281 + 4.081632653t + t2 = 2.448979592 + 4.164931281

Combine like terms: 2.448979592 + 4.164931281 = 6.613910873
4.164931281 + 4.081632653t + t2 = 6.613910873

Factor a perfect square on the left side:
(t + 2.040816327)(t + 2.040816327) = 6.613910873

Calculate the square root of the right side: 2.571752491

Break this problem into two subproblems by setting 
(t + 2.040816327) equal to 2.571752491 and -2.571752491.

Subproblem 1

t + 2.040816327 = 2.571752491 Simplifying t + 2.040816327 = 2.571752491 Reorder the terms: 2.040816327 + t = 2.571752491 Solving 2.040816327 + t = 2.571752491 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 = 2.571752491 + -2.040816327 Combine like terms: 2.040816327 + -2.040816327 = 0.000000000 0.000000000 + t = 2.571752491 + -2.040816327 t = 2.571752491 + -2.040816327 Combine like terms: 2.571752491 + -2.040816327 = 0.530936164 t = 0.530936164 Simplifying t = 0.530936164

Subproblem 2

t + 2.040816327 = -2.571752491 Simplifying t + 2.040816327 = -2.571752491 Reorder the terms: 2.040816327 + t = -2.571752491 Solving 2.040816327 + t = -2.571752491 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 = -2.571752491 + -2.040816327 Combine like terms: 2.040816327 + -2.040816327 = 0.000000000 0.000000000 + t = -2.571752491 + -2.040816327 t = -2.571752491 + -2.040816327 Combine like terms: -2.571752491 + -2.040816327 = -4.612568818 t = -4.612568818 Simplifying t = -4.612568818

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.530936164, -4.612568818}

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