7v^2=15+6v

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Solution for 7v^2=15+6v equation:


Simplifying
7v2 = 15 + 6v

Solving
7v2 = 15 + 6v

Solving for variable 'v'.

Reorder the terms:
-15 + -6v + 7v2 = 15 + 6v + -15 + -6v

Reorder the terms:
-15 + -6v + 7v2 = 15 + -15 + 6v + -6v

Combine like terms: 15 + -15 = 0
-15 + -6v + 7v2 = 0 + 6v + -6v
-15 + -6v + 7v2 = 6v + -6v

Combine like terms: 6v + -6v = 0
-15 + -6v + 7v2 = 0

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

Divide each side by '7'.
-2.142857143 + -0.8571428571v + v2 = 0

Move the constant term to the right:

Add '2.142857143' to each side of the equation.
-2.142857143 + -0.8571428571v + 2.142857143 + v2 = 0 + 2.142857143

Reorder the terms:
-2.142857143 + 2.142857143 + -0.8571428571v + v2 = 0 + 2.142857143

Combine like terms: -2.142857143 + 2.142857143 = 0.000000000
0.000000000 + -0.8571428571v + v2 = 0 + 2.142857143
-0.8571428571v + v2 = 0 + 2.142857143

Combine like terms: 0 + 2.142857143 = 2.142857143
-0.8571428571v + v2 = 2.142857143

The v term is -0.8571428571v.  Take half its coefficient (-0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
-0.8571428571v + 0.1836734694 + v2 = 2.142857143 + 0.1836734694

Reorder the terms:
0.1836734694 + -0.8571428571v + v2 = 2.142857143 + 0.1836734694

Combine like terms: 2.142857143 + 0.1836734694 = 2.3265306124
0.1836734694 + -0.8571428571v + v2 = 2.3265306124

Factor a perfect square on the left side:
(v + -0.4285714286)(v + -0.4285714286) = 2.3265306124

Calculate the square root of the right side: 1.525296893

Break this problem into two subproblems by setting 
(v + -0.4285714286) equal to 1.525296893 and -1.525296893.

Subproblem 1

v + -0.4285714286 = 1.525296893 Simplifying v + -0.4285714286 = 1.525296893 Reorder the terms: -0.4285714286 + v = 1.525296893 Solving -0.4285714286 + v = 1.525296893 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + v = 1.525296893 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + v = 1.525296893 + 0.4285714286 v = 1.525296893 + 0.4285714286 Combine like terms: 1.525296893 + 0.4285714286 = 1.9538683216 v = 1.9538683216 Simplifying v = 1.9538683216

Subproblem 2

v + -0.4285714286 = -1.525296893 Simplifying v + -0.4285714286 = -1.525296893 Reorder the terms: -0.4285714286 + v = -1.525296893 Solving -0.4285714286 + v = -1.525296893 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + v = -1.525296893 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + v = -1.525296893 + 0.4285714286 v = -1.525296893 + 0.4285714286 Combine like terms: -1.525296893 + 0.4285714286 = -1.0967254644 v = -1.0967254644 Simplifying v = -1.0967254644

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.9538683216, -1.0967254644}

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