0=4.9t^2+20t+10

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Solution for 0=4.9t^2+20t+10 equation:


Simplifying
0 = 4.9t2 + 20t + 10

Reorder the terms:
0 = 10 + 20t + 4.9t2

Solving
0 = 10 + 20t + 4.9t2

Solving for variable 't'.

Combine like terms: 0 + -10 = -10
-10 + -20t + -4.9t2 = 10 + 20t + 4.9t2 + -10 + -20t + -4.9t2

Reorder the terms:
-10 + -20t + -4.9t2 = 10 + -10 + 20t + -20t + 4.9t2 + -4.9t2

Combine like terms: 10 + -10 = 0
-10 + -20t + -4.9t2 = 0 + 20t + -20t + 4.9t2 + -4.9t2
-10 + -20t + -4.9t2 = 20t + -20t + 4.9t2 + -4.9t2

Combine like terms: 20t + -20t = 0
-10 + -20t + -4.9t2 = 0 + 4.9t2 + -4.9t2
-10 + -20t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
-10 + -20t + -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'.
2.040816327 + 4.081632653t + t2 = 0

Move the constant term to the right:

Add '-2.040816327' to each side of the equation.
2.040816327 + 4.081632653t + -2.040816327 + t2 = 0 + -2.040816327

Reorder the terms:
2.040816327 + -2.040816327 + 4.081632653t + t2 = 0 + -2.040816327

Combine like terms: 2.040816327 + -2.040816327 = 0.000000000
0.000000000 + 4.081632653t + t2 = 0 + -2.040816327
4.081632653t + t2 = 0 + -2.040816327

Combine like terms: 0 + -2.040816327 = -2.040816327
4.081632653t + t2 = -2.040816327

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 = -2.040816327 + 4.164931281

Reorder the terms:
4.164931281 + 4.081632653t + t2 = -2.040816327 + 4.164931281

Combine like terms: -2.040816327 + 4.164931281 = 2.124114954
4.164931281 + 4.081632653t + t2 = 2.124114954

Factor a perfect square on the left side:
(t + 2.040816327)(t + 2.040816327) = 2.124114954

Calculate the square root of the right side: 1.457434374

Break this problem into two subproblems by setting 
(t + 2.040816327) equal to 1.457434374 and -1.457434374.

Subproblem 1

t + 2.040816327 = 1.457434374 Simplifying t + 2.040816327 = 1.457434374 Reorder the terms: 2.040816327 + t = 1.457434374 Solving 2.040816327 + t = 1.457434374 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 = 1.457434374 + -2.040816327 Combine like terms: 2.040816327 + -2.040816327 = 0.000000000 0.000000000 + t = 1.457434374 + -2.040816327 t = 1.457434374 + -2.040816327 Combine like terms: 1.457434374 + -2.040816327 = -0.583381953 t = -0.583381953 Simplifying t = -0.583381953

Subproblem 2

t + 2.040816327 = -1.457434374 Simplifying t + 2.040816327 = -1.457434374 Reorder the terms: 2.040816327 + t = -1.457434374 Solving 2.040816327 + t = -1.457434374 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 = -1.457434374 + -2.040816327 Combine like terms: 2.040816327 + -2.040816327 = 0.000000000 0.000000000 + t = -1.457434374 + -2.040816327 t = -1.457434374 + -2.040816327 Combine like terms: -1.457434374 + -2.040816327 = -3.498250701 t = -3.498250701 Simplifying t = -3.498250701

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.583381953, -3.498250701}

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