4.9t^2-40t+10=0

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Solution for 4.9t^2-40t+10=0 equation:


Simplifying
4.9t2 + -40t + 10 = 0

Reorder the terms:
10 + -40t + 4.9t2 = 0

Solving
10 + -40t + 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'.
2.040816327 + -8.163265306t + t2 = 0

Move the constant term to the right:

Add '-2.040816327' to each side of the equation.
2.040816327 + -8.163265306t + -2.040816327 + t2 = 0 + -2.040816327

Reorder the terms:
2.040816327 + -2.040816327 + -8.163265306t + t2 = 0 + -2.040816327

Combine like terms: 2.040816327 + -2.040816327 = 0.000000000
0.000000000 + -8.163265306t + t2 = 0 + -2.040816327
-8.163265306t + t2 = 0 + -2.040816327

Combine like terms: 0 + -2.040816327 = -2.040816327
-8.163265306t + t2 = -2.040816327

The t term is -8.163265306t.  Take half its coefficient (-4.081632653).
Square it (16.65972511) and add it to both sides.

Add '16.65972511' to each side of the equation.
-8.163265306t + 16.65972511 + t2 = -2.040816327 + 16.65972511

Reorder the terms:
16.65972511 + -8.163265306t + t2 = -2.040816327 + 16.65972511

Combine like terms: -2.040816327 + 16.65972511 = 14.618908783
16.65972511 + -8.163265306t + t2 = 14.618908783

Factor a perfect square on the left side:
(t + -4.081632653)(t + -4.081632653) = 14.618908783

Calculate the square root of the right side: 3.823468162

Break this problem into two subproblems by setting 
(t + -4.081632653) equal to 3.823468162 and -3.823468162.

Subproblem 1

t + -4.081632653 = 3.823468162 Simplifying t + -4.081632653 = 3.823468162 Reorder the terms: -4.081632653 + t = 3.823468162 Solving -4.081632653 + t = 3.823468162 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.081632653' to each side of the equation. -4.081632653 + 4.081632653 + t = 3.823468162 + 4.081632653 Combine like terms: -4.081632653 + 4.081632653 = 0.000000000 0.000000000 + t = 3.823468162 + 4.081632653 t = 3.823468162 + 4.081632653 Combine like terms: 3.823468162 + 4.081632653 = 7.905100815 t = 7.905100815 Simplifying t = 7.905100815

Subproblem 2

t + -4.081632653 = -3.823468162 Simplifying t + -4.081632653 = -3.823468162 Reorder the terms: -4.081632653 + t = -3.823468162 Solving -4.081632653 + t = -3.823468162 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.081632653' to each side of the equation. -4.081632653 + 4.081632653 + t = -3.823468162 + 4.081632653 Combine like terms: -4.081632653 + 4.081632653 = 0.000000000 0.000000000 + t = -3.823468162 + 4.081632653 t = -3.823468162 + 4.081632653 Combine like terms: -3.823468162 + 4.081632653 = 0.258164491 t = 0.258164491 Simplifying t = 0.258164491

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.905100815, 0.258164491}

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