5v^2-7v=1

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Solution for 5v^2-7v=1 equation:


Simplifying
5v2 + -7v = 1

Reorder the terms:
-7v + 5v2 = 1

Solving
-7v + 5v2 = 1

Solving for variable 'v'.

Reorder the terms:
-1 + -7v + 5v2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + -7v + 5v2 = 0

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

Divide each side by '5'.
-0.2 + -1.4v + v2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -1.4v + 0.2 + v2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -1.4v + v2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -1.4v + v2 = 0 + 0.2
-1.4v + v2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-1.4v + v2 = 0.2

The v term is -1.4v.  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.
-1.4v + 0.49 + v2 = 0.2 + 0.49

Reorder the terms:
0.49 + -1.4v + v2 = 0.2 + 0.49

Combine like terms: 0.2 + 0.49 = 0.69
0.49 + -1.4v + v2 = 0.69

Factor a perfect square on the left side:
(v + -0.7)(v + -0.7) = 0.69

Calculate the square root of the right side: 0.830662386

Break this problem into two subproblems by setting 
(v + -0.7) equal to 0.830662386 and -0.830662386.

Subproblem 1

v + -0.7 = 0.830662386 Simplifying v + -0.7 = 0.830662386 Reorder the terms: -0.7 + v = 0.830662386 Solving -0.7 + v = 0.830662386 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + v = 0.830662386 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + v = 0.830662386 + 0.7 v = 0.830662386 + 0.7 Combine like terms: 0.830662386 + 0.7 = 1.530662386 v = 1.530662386 Simplifying v = 1.530662386

Subproblem 2

v + -0.7 = -0.830662386 Simplifying v + -0.7 = -0.830662386 Reorder the terms: -0.7 + v = -0.830662386 Solving -0.7 + v = -0.830662386 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + v = -0.830662386 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + v = -0.830662386 + 0.7 v = -0.830662386 + 0.7 Combine like terms: -0.830662386 + 0.7 = -0.130662386 v = -0.130662386 Simplifying v = -0.130662386

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.530662386, -0.130662386}

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