7t^2+5t-5=0

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


Simplifying
7t2 + 5t + -5 = 0

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

Solving
-5 + 5t + 7t2 = 0

Solving for variable 't'.

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

Divide each side by '7'.
-0.7142857143 + 0.7142857143t + t2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 0.7142857143t + 0.7142857143 + t2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 0.7142857143t + t2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 0.7142857143t + t2 = 0 + 0.7142857143
0.7142857143t + t2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
0.7142857143t + t2 = 0.7142857143

The t term is 0.7142857143t.  Take half its coefficient (0.3571428572).
Square it (0.1275510204) and add it to both sides.

Add '0.1275510204' to each side of the equation.
0.7142857143t + 0.1275510204 + t2 = 0.7142857143 + 0.1275510204

Reorder the terms:
0.1275510204 + 0.7142857143t + t2 = 0.7142857143 + 0.1275510204

Combine like terms: 0.7142857143 + 0.1275510204 = 0.8418367347
0.1275510204 + 0.7142857143t + t2 = 0.8418367347

Factor a perfect square on the left side:
(t + 0.3571428572)(t + 0.3571428572) = 0.8418367347

Calculate the square root of the right side: 0.917516613

Break this problem into two subproblems by setting 
(t + 0.3571428572) equal to 0.917516613 and -0.917516613.

Subproblem 1

t + 0.3571428572 = 0.917516613 Simplifying t + 0.3571428572 = 0.917516613 Reorder the terms: 0.3571428572 + t = 0.917516613 Solving 0.3571428572 + t = 0.917516613 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3571428572' to each side of the equation. 0.3571428572 + -0.3571428572 + t = 0.917516613 + -0.3571428572 Combine like terms: 0.3571428572 + -0.3571428572 = 0.0000000000 0.0000000000 + t = 0.917516613 + -0.3571428572 t = 0.917516613 + -0.3571428572 Combine like terms: 0.917516613 + -0.3571428572 = 0.5603737558 t = 0.5603737558 Simplifying t = 0.5603737558

Subproblem 2

t + 0.3571428572 = -0.917516613 Simplifying t + 0.3571428572 = -0.917516613 Reorder the terms: 0.3571428572 + t = -0.917516613 Solving 0.3571428572 + t = -0.917516613 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3571428572' to each side of the equation. 0.3571428572 + -0.3571428572 + t = -0.917516613 + -0.3571428572 Combine like terms: 0.3571428572 + -0.3571428572 = 0.0000000000 0.0000000000 + t = -0.917516613 + -0.3571428572 t = -0.917516613 + -0.3571428572 Combine like terms: -0.917516613 + -0.3571428572 = -1.2746594702 t = -1.2746594702 Simplifying t = -1.2746594702

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.5603737558, -1.2746594702}

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