9v^2-19=7v^2+11v

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Solution for 9v^2-19=7v^2+11v equation:


Simplifying
9v2 + -19 = 7v2 + 11v

Reorder the terms:
-19 + 9v2 = 7v2 + 11v

Reorder the terms:
-19 + 9v2 = 11v + 7v2

Solving
-19 + 9v2 = 11v + 7v2

Solving for variable 'v'.

Reorder the terms:
-19 + -11v + 9v2 + -7v2 = 11v + 7v2 + -11v + -7v2

Combine like terms: 9v2 + -7v2 = 2v2
-19 + -11v + 2v2 = 11v + 7v2 + -11v + -7v2

Reorder the terms:
-19 + -11v + 2v2 = 11v + -11v + 7v2 + -7v2

Combine like terms: 11v + -11v = 0
-19 + -11v + 2v2 = 0 + 7v2 + -7v2
-19 + -11v + 2v2 = 7v2 + -7v2

Combine like terms: 7v2 + -7v2 = 0
-19 + -11v + 2v2 = 0

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

Divide each side by '2'.
-9.5 + -5.5v + v2 = 0

Move the constant term to the right:

Add '9.5' to each side of the equation.
-9.5 + -5.5v + 9.5 + v2 = 0 + 9.5

Reorder the terms:
-9.5 + 9.5 + -5.5v + v2 = 0 + 9.5

Combine like terms: -9.5 + 9.5 = 0.0
0.0 + -5.5v + v2 = 0 + 9.5
-5.5v + v2 = 0 + 9.5

Combine like terms: 0 + 9.5 = 9.5
-5.5v + v2 = 9.5

The v term is -5.5v.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5v + 7.5625 + v2 = 9.5 + 7.5625

Reorder the terms:
7.5625 + -5.5v + v2 = 9.5 + 7.5625

Combine like terms: 9.5 + 7.5625 = 17.0625
7.5625 + -5.5v + v2 = 17.0625

Factor a perfect square on the left side:
(v + -2.75)(v + -2.75) = 17.0625

Calculate the square root of the right side: 4.13067791

Break this problem into two subproblems by setting 
(v + -2.75) equal to 4.13067791 and -4.13067791.

Subproblem 1

v + -2.75 = 4.13067791 Simplifying v + -2.75 = 4.13067791 Reorder the terms: -2.75 + v = 4.13067791 Solving -2.75 + v = 4.13067791 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + v = 4.13067791 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + v = 4.13067791 + 2.75 v = 4.13067791 + 2.75 Combine like terms: 4.13067791 + 2.75 = 6.88067791 v = 6.88067791 Simplifying v = 6.88067791

Subproblem 2

v + -2.75 = -4.13067791 Simplifying v + -2.75 = -4.13067791 Reorder the terms: -2.75 + v = -4.13067791 Solving -2.75 + v = -4.13067791 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + v = -4.13067791 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + v = -4.13067791 + 2.75 v = -4.13067791 + 2.75 Combine like terms: -4.13067791 + 2.75 = -1.38067791 v = -1.38067791 Simplifying v = -1.38067791

Solution

The solution to the problem is based on the solutions from the subproblems. v = {6.88067791, -1.38067791}

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