0=-4.9t^2+5t+2

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


Simplifying
0 = -4.9t2 + 5t + 2

Reorder the terms:
0 = 2 + 5t + -4.9t2

Solving
0 = 2 + 5t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -2 = -2
-2 + -5t + 4.9t2 = 2 + 5t + -4.9t2 + -2 + -5t + 4.9t2

Reorder the terms:
-2 + -5t + 4.9t2 = 2 + -2 + 5t + -5t + -4.9t2 + 4.9t2

Combine like terms: 2 + -2 = 0
-2 + -5t + 4.9t2 = 0 + 5t + -5t + -4.9t2 + 4.9t2
-2 + -5t + 4.9t2 = 5t + -5t + -4.9t2 + 4.9t2

Combine like terms: 5t + -5t = 0
-2 + -5t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-2 + -5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-2 + -5t + 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 + -1.020408163t + t2 = 0

Move the constant term to the right:

Add '0.4081632653' to each side of the equation.
-0.4081632653 + -1.020408163t + 0.4081632653 + t2 = 0 + 0.4081632653

Reorder the terms:
-0.4081632653 + 0.4081632653 + -1.020408163t + t2 = 0 + 0.4081632653

Combine like terms: -0.4081632653 + 0.4081632653 = 0.0000000000
0.0000000000 + -1.020408163t + t2 = 0 + 0.4081632653
-1.020408163t + t2 = 0 + 0.4081632653

Combine like terms: 0 + 0.4081632653 = 0.4081632653
-1.020408163t + t2 = 0.4081632653

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 = 0.4081632653 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163t + t2 = 0.4081632653 + 0.2603082048

Combine like terms: 0.4081632653 + 0.2603082048 = 0.6684714701
0.2603082048 + -1.020408163t + t2 = 0.6684714701

Factor a perfect square on the left side:
(t + -0.5102040815)(t + -0.5102040815) = 0.6684714701

Calculate the square root of the right side: 0.817601046

Break this problem into two subproblems by setting 
(t + -0.5102040815) equal to 0.817601046 and -0.817601046.

Subproblem 1

t + -0.5102040815 = 0.817601046 Simplifying t + -0.5102040815 = 0.817601046 Reorder the terms: -0.5102040815 + t = 0.817601046 Solving -0.5102040815 + t = 0.817601046 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 = 0.817601046 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = 0.817601046 + 0.5102040815 t = 0.817601046 + 0.5102040815 Combine like terms: 0.817601046 + 0.5102040815 = 1.3278051275 t = 1.3278051275 Simplifying t = 1.3278051275

Subproblem 2

t + -0.5102040815 = -0.817601046 Simplifying t + -0.5102040815 = -0.817601046 Reorder the terms: -0.5102040815 + t = -0.817601046 Solving -0.5102040815 + t = -0.817601046 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 = -0.817601046 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = -0.817601046 + 0.5102040815 t = -0.817601046 + 0.5102040815 Combine like terms: -0.817601046 + 0.5102040815 = -0.3073969645 t = -0.3073969645 Simplifying t = -0.3073969645

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.3278051275, -0.3073969645}

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