4.9t^2-(4.2104*0.966*t)-0.28=0

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Solution for 4.9t^2-(4.2104*0.966*t)-0.28=0 equation:


Simplifying
4.9t2 + -1(4.2104 * 0.966t) + -0.28 = 0

Multiply 4.2104 * 0.966
4.9t2 + -1(4.0672464t) + -0.28 = 0

Remove parenthesis around (4.0672464t)
4.9t2 + -1 * 4.0672464t + -0.28 = 0

Multiply -1 * 4.0672464
4.9t2 + -4.0672464t + -0.28 = 0

Reorder the terms:
-0.28 + -4.0672464t + 4.9t2 = 0

Solving
-0.28 + -4.0672464t + 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'.
-0.05714285714 + -0.8300502857t + t2 = 0

Move the constant term to the right:

Add '0.05714285714' to each side of the equation.
-0.05714285714 + -0.8300502857t + 0.05714285714 + t2 = 0 + 0.05714285714

Reorder the terms:
-0.05714285714 + 0.05714285714 + -0.8300502857t + t2 = 0 + 0.05714285714

Combine like terms: -0.05714285714 + 0.05714285714 = 0.00000000000
0.00000000000 + -0.8300502857t + t2 = 0 + 0.05714285714
-0.8300502857t + t2 = 0 + 0.05714285714

Combine like terms: 0 + 0.05714285714 = 0.05714285714
-0.8300502857t + t2 = 0.05714285714

The t term is -0.8300502857t.  Take half its coefficient (-0.4150251429).
Square it (0.1722458692) and add it to both sides.

Add '0.1722458692' to each side of the equation.
-0.8300502857t + 0.1722458692 + t2 = 0.05714285714 + 0.1722458692

Reorder the terms:
0.1722458692 + -0.8300502857t + t2 = 0.05714285714 + 0.1722458692

Combine like terms: 0.05714285714 + 0.1722458692 = 0.22938872634
0.1722458692 + -0.8300502857t + t2 = 0.22938872634

Factor a perfect square on the left side:
(t + -0.4150251429)(t + -0.4150251429) = 0.22938872634

Calculate the square root of the right side: 0.478945431

Break this problem into two subproblems by setting 
(t + -0.4150251429) equal to 0.478945431 and -0.478945431.

Subproblem 1

t + -0.4150251429 = 0.478945431 Simplifying t + -0.4150251429 = 0.478945431 Reorder the terms: -0.4150251429 + t = 0.478945431 Solving -0.4150251429 + t = 0.478945431 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4150251429' to each side of the equation. -0.4150251429 + 0.4150251429 + t = 0.478945431 + 0.4150251429 Combine like terms: -0.4150251429 + 0.4150251429 = 0.0000000000 0.0000000000 + t = 0.478945431 + 0.4150251429 t = 0.478945431 + 0.4150251429 Combine like terms: 0.478945431 + 0.4150251429 = 0.8939705739 t = 0.8939705739 Simplifying t = 0.8939705739

Subproblem 2

t + -0.4150251429 = -0.478945431 Simplifying t + -0.4150251429 = -0.478945431 Reorder the terms: -0.4150251429 + t = -0.478945431 Solving -0.4150251429 + t = -0.478945431 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4150251429' to each side of the equation. -0.4150251429 + 0.4150251429 + t = -0.478945431 + 0.4150251429 Combine like terms: -0.4150251429 + 0.4150251429 = 0.0000000000 0.0000000000 + t = -0.478945431 + 0.4150251429 t = -0.478945431 + 0.4150251429 Combine like terms: -0.478945431 + 0.4150251429 = -0.0639202881 t = -0.0639202881 Simplifying t = -0.0639202881

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.8939705739, -0.0639202881}

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