4.9t^2-5t-19.6=0

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Solution for 4.9t^2-5t-19.6=0 equation:


Simplifying
4.9t2 + -5t + -19.6 = 0

Reorder the terms:
-19.6 + -5t + 4.9t2 = 0

Solving
-19.6 + -5t + 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'.
-4 + -1.020408163t + t2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -1.020408163t + 4 + t2 = 0 + 4

Reorder the terms:
-4 + 4 + -1.020408163t + t2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1.020408163t + t2 = 0 + 4
-1.020408163t + t2 = 0 + 4

Combine like terms: 0 + 4 = 4
-1.020408163t + t2 = 4

The t term is -1.020408163t.  Take half its coefficient (-0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
-1.020408163t + 0.2603082048 + t2 = 4 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163t + t2 = 4 + 0.2603082048

Combine like terms: 4 + 0.2603082048 = 4.2603082048
0.2603082048 + -1.020408163t + t2 = 4.2603082048

Factor a perfect square on the left side:
(t + -0.5102040815)(t + -0.5102040815) = 4.2603082048

Calculate the square root of the right side: 2.064051406

Break this problem into two subproblems by setting 
(t + -0.5102040815) equal to 2.064051406 and -2.064051406.

Subproblem 1

t + -0.5102040815 = 2.064051406 Simplifying t + -0.5102040815 = 2.064051406 Reorder the terms: -0.5102040815 + t = 2.064051406 Solving -0.5102040815 + t = 2.064051406 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + t = 2.064051406 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = 2.064051406 + 0.5102040815 t = 2.064051406 + 0.5102040815 Combine like terms: 2.064051406 + 0.5102040815 = 2.5742554875 t = 2.5742554875 Simplifying t = 2.5742554875

Subproblem 2

t + -0.5102040815 = -2.064051406 Simplifying t + -0.5102040815 = -2.064051406 Reorder the terms: -0.5102040815 + t = -2.064051406 Solving -0.5102040815 + t = -2.064051406 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + t = -2.064051406 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = -2.064051406 + 0.5102040815 t = -2.064051406 + 0.5102040815 Combine like terms: -2.064051406 + 0.5102040815 = -1.5538473245 t = -1.5538473245 Simplifying t = -1.5538473245

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.5742554875, -1.5538473245}

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