0=-4.9t^2+10t-2

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


Simplifying
0 = -4.9t2 + 10t + -2

Reorder the terms:
0 = -2 + 10t + -4.9t2

Solving
0 = -2 + 10t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + 2 = 2
2 + -10t + 4.9t2 = -2 + 10t + -4.9t2 + 2 + -10t + 4.9t2

Reorder the terms:
2 + -10t + 4.9t2 = -2 + 2 + 10t + -10t + -4.9t2 + 4.9t2

Combine like terms: -2 + 2 = 0
2 + -10t + 4.9t2 = 0 + 10t + -10t + -4.9t2 + 4.9t2
2 + -10t + 4.9t2 = 10t + -10t + -4.9t2 + 4.9t2

Combine like terms: 10t + -10t = 0
2 + -10t + 4.9t2 = 0 + -4.9t2 + 4.9t2
2 + -10t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
2 + -10t + 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'.
0.4081632653 + -2.040816327t + t2 = 0

Move the constant term to the right:

Add '-0.4081632653' to each side of the equation.
0.4081632653 + -2.040816327t + -0.4081632653 + t2 = 0 + -0.4081632653

Reorder the terms:
0.4081632653 + -0.4081632653 + -2.040816327t + t2 = 0 + -0.4081632653

Combine like terms: 0.4081632653 + -0.4081632653 = 0.0000000000
0.0000000000 + -2.040816327t + t2 = 0 + -0.4081632653
-2.040816327t + t2 = 0 + -0.4081632653

Combine like terms: 0 + -0.4081632653 = -0.4081632653
-2.040816327t + t2 = -0.4081632653

The t term is -2.040816327t.  Take half its coefficient (-1.020408164).
Square it (1.041232821) and add it to both sides.

Add '1.041232821' to each side of the equation.
-2.040816327t + 1.041232821 + t2 = -0.4081632653 + 1.041232821

Reorder the terms:
1.041232821 + -2.040816327t + t2 = -0.4081632653 + 1.041232821

Combine like terms: -0.4081632653 + 1.041232821 = 0.6330695557
1.041232821 + -2.040816327t + t2 = 0.6330695557

Factor a perfect square on the left side:
(t + -1.020408164)(t + -1.020408164) = 0.6330695557

Calculate the square root of the right side: 0.795656682

Break this problem into two subproblems by setting 
(t + -1.020408164) equal to 0.795656682 and -0.795656682.

Subproblem 1

t + -1.020408164 = 0.795656682 Simplifying t + -1.020408164 = 0.795656682 Reorder the terms: -1.020408164 + t = 0.795656682 Solving -1.020408164 + t = 0.795656682 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + t = 0.795656682 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + t = 0.795656682 + 1.020408164 t = 0.795656682 + 1.020408164 Combine like terms: 0.795656682 + 1.020408164 = 1.816064846 t = 1.816064846 Simplifying t = 1.816064846

Subproblem 2

t + -1.020408164 = -0.795656682 Simplifying t + -1.020408164 = -0.795656682 Reorder the terms: -1.020408164 + t = -0.795656682 Solving -1.020408164 + t = -0.795656682 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + t = -0.795656682 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + t = -0.795656682 + 1.020408164 t = -0.795656682 + 1.020408164 Combine like terms: -0.795656682 + 1.020408164 = 0.224751482 t = 0.224751482 Simplifying t = 0.224751482

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.816064846, 0.224751482}

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