0=5t^2-7t-2

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Solution for 0=5t^2-7t-2 equation:


Simplifying
0 = 5t2 + -7t + -2

Reorder the terms:
0 = -2 + -7t + 5t2

Solving
0 = -2 + -7t + 5t2

Solving for variable 't'.

Combine like terms: 0 + 2 = 2
2 + 7t + -5t2 = -2 + -7t + 5t2 + 2 + 7t + -5t2

Reorder the terms:
2 + 7t + -5t2 = -2 + 2 + -7t + 7t + 5t2 + -5t2

Combine like terms: -2 + 2 = 0
2 + 7t + -5t2 = 0 + -7t + 7t + 5t2 + -5t2
2 + 7t + -5t2 = -7t + 7t + 5t2 + -5t2

Combine like terms: -7t + 7t = 0
2 + 7t + -5t2 = 0 + 5t2 + -5t2
2 + 7t + -5t2 = 5t2 + -5t2

Combine like terms: 5t2 + -5t2 = 0
2 + 7t + -5t2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.4 + -1.4t + t2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -1.4t + 0.4 + t2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -1.4t + t2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -1.4t + t2 = 0 + 0.4
-1.4t + t2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-1.4t + t2 = 0.4

The t term is -1.4t.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4t + 0.49 + t2 = 0.4 + 0.49

Reorder the terms:
0.49 + -1.4t + t2 = 0.4 + 0.49

Combine like terms: 0.4 + 0.49 = 0.89
0.49 + -1.4t + t2 = 0.89

Factor a perfect square on the left side:
(t + -0.7)(t + -0.7) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(t + -0.7) equal to 0.943398113 and -0.943398113.

Subproblem 1

t + -0.7 = 0.943398113 Simplifying t + -0.7 = 0.943398113 Reorder the terms: -0.7 + t = 0.943398113 Solving -0.7 + t = 0.943398113 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + t = 0.943398113 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + t = 0.943398113 + 0.7 t = 0.943398113 + 0.7 Combine like terms: 0.943398113 + 0.7 = 1.643398113 t = 1.643398113 Simplifying t = 1.643398113

Subproblem 2

t + -0.7 = -0.943398113 Simplifying t + -0.7 = -0.943398113 Reorder the terms: -0.7 + t = -0.943398113 Solving -0.7 + t = -0.943398113 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + t = -0.943398113 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + t = -0.943398113 + 0.7 t = -0.943398113 + 0.7 Combine like terms: -0.943398113 + 0.7 = -0.243398113 t = -0.243398113 Simplifying t = -0.243398113

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.643398113, -0.243398113}

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