7v^2-7v-3=0

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Solution for 7v^2-7v-3=0 equation:


Simplifying
7v2 + -7v + -3 = 0

Reorder the terms:
-3 + -7v + 7v2 = 0

Solving
-3 + -7v + 7v2 = 0

Solving for variable 'v'.

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

Divide each side by '7'.
-0.4285714286 + -1v + v2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + -1v + 0.4285714286 + v2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + -1v + v2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + -1v + v2 = 0 + 0.4285714286
-1v + v2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
-1v + v2 = 0.4285714286

The v term is -1v.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1v + 0.25 + v2 = 0.4285714286 + 0.25

Reorder the terms:
0.25 + -1v + v2 = 0.4285714286 + 0.25

Combine like terms: 0.4285714286 + 0.25 = 0.6785714286
0.25 + -1v + v2 = 0.6785714286

Factor a perfect square on the left side:
(v + -0.5)(v + -0.5) = 0.6785714286

Calculate the square root of the right side: 0.823754471

Break this problem into two subproblems by setting 
(v + -0.5) equal to 0.823754471 and -0.823754471.

Subproblem 1

v + -0.5 = 0.823754471 Simplifying v + -0.5 = 0.823754471 Reorder the terms: -0.5 + v = 0.823754471 Solving -0.5 + v = 0.823754471 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = 0.823754471 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = 0.823754471 + 0.5 v = 0.823754471 + 0.5 Combine like terms: 0.823754471 + 0.5 = 1.323754471 v = 1.323754471 Simplifying v = 1.323754471

Subproblem 2

v + -0.5 = -0.823754471 Simplifying v + -0.5 = -0.823754471 Reorder the terms: -0.5 + v = -0.823754471 Solving -0.5 + v = -0.823754471 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = -0.823754471 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = -0.823754471 + 0.5 v = -0.823754471 + 0.5 Combine like terms: -0.823754471 + 0.5 = -0.323754471 v = -0.323754471 Simplifying v = -0.323754471

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.323754471, -0.323754471}

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