1.4t^2+6t+2.8=0

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Solution for 1.4t^2+6t+2.8=0 equation:


Simplifying
1.4t2 + 6t + 2.8 = 0

Reorder the terms:
2.8 + 6t + 1.4t2 = 0

Solving
2.8 + 6t + 1.4t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
1.4 the coefficient of the squared term: 

Divide each side by '1.4'.
2 + 4.285714286t + t2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 4.285714286t + -2 + t2 = 0 + -2

Reorder the terms:
2 + -2 + 4.285714286t + t2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 4.285714286t + t2 = 0 + -2
4.285714286t + t2 = 0 + -2

Combine like terms: 0 + -2 = -2
4.285714286t + t2 = -2

The t term is 4.285714286t.  Take half its coefficient (2.142857143).
Square it (4.591836735) and add it to both sides.

Add '4.591836735' to each side of the equation.
4.285714286t + 4.591836735 + t2 = -2 + 4.591836735

Reorder the terms:
4.591836735 + 4.285714286t + t2 = -2 + 4.591836735

Combine like terms: -2 + 4.591836735 = 2.591836735
4.591836735 + 4.285714286t + t2 = 2.591836735

Factor a perfect square on the left side:
(t + 2.142857143)(t + 2.142857143) = 2.591836735

Calculate the square root of the right side: 1.609918239

Break this problem into two subproblems by setting 
(t + 2.142857143) equal to 1.609918239 and -1.609918239.

Subproblem 1

t + 2.142857143 = 1.609918239 Simplifying t + 2.142857143 = 1.609918239 Reorder the terms: 2.142857143 + t = 1.609918239 Solving 2.142857143 + t = 1.609918239 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.142857143' to each side of the equation. 2.142857143 + -2.142857143 + t = 1.609918239 + -2.142857143 Combine like terms: 2.142857143 + -2.142857143 = 0.000000000 0.000000000 + t = 1.609918239 + -2.142857143 t = 1.609918239 + -2.142857143 Combine like terms: 1.609918239 + -2.142857143 = -0.532938904 t = -0.532938904 Simplifying t = -0.532938904

Subproblem 2

t + 2.142857143 = -1.609918239 Simplifying t + 2.142857143 = -1.609918239 Reorder the terms: 2.142857143 + t = -1.609918239 Solving 2.142857143 + t = -1.609918239 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.142857143' to each side of the equation. 2.142857143 + -2.142857143 + t = -1.609918239 + -2.142857143 Combine like terms: 2.142857143 + -2.142857143 = 0.000000000 0.000000000 + t = -1.609918239 + -2.142857143 t = -1.609918239 + -2.142857143 Combine like terms: -1.609918239 + -2.142857143 = -3.752775382 t = -3.752775382 Simplifying t = -3.752775382

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.532938904, -3.752775382}

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