(-2v^2+7v-4)-(-3v^2+9v-3)+(-2v^2-5v+3)=0

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Solution for (-2v^2+7v-4)-(-3v^2+9v-3)+(-2v^2-5v+3)=0 equation:


Simplifying
(-2v2 + 7v + -4) + -1(-3v2 + 9v + -3) + (-2v2 + -5v + 3) = 0

Reorder the terms:
(-4 + 7v + -2v2) + -1(-3v2 + 9v + -3) + (-2v2 + -5v + 3) = 0

Remove parenthesis around (-4 + 7v + -2v2)
-4 + 7v + -2v2 + -1(-3v2 + 9v + -3) + (-2v2 + -5v + 3) = 0

Reorder the terms:
-4 + 7v + -2v2 + -1(-3 + 9v + -3v2) + (-2v2 + -5v + 3) = 0
-4 + 7v + -2v2 + (-3 * -1 + 9v * -1 + -3v2 * -1) + (-2v2 + -5v + 3) = 0
-4 + 7v + -2v2 + (3 + -9v + 3v2) + (-2v2 + -5v + 3) = 0

Reorder the terms:
-4 + 7v + -2v2 + 3 + -9v + 3v2 + (3 + -5v + -2v2) = 0

Remove parenthesis around (3 + -5v + -2v2)
-4 + 7v + -2v2 + 3 + -9v + 3v2 + 3 + -5v + -2v2 = 0

Reorder the terms:
-4 + 3 + 3 + 7v + -9v + -5v + -2v2 + 3v2 + -2v2 = 0

Combine like terms: -4 + 3 = -1
-1 + 3 + 7v + -9v + -5v + -2v2 + 3v2 + -2v2 = 0

Combine like terms: -1 + 3 = 2
2 + 7v + -9v + -5v + -2v2 + 3v2 + -2v2 = 0

Combine like terms: 7v + -9v = -2v
2 + -2v + -5v + -2v2 + 3v2 + -2v2 = 0

Combine like terms: -2v + -5v = -7v
2 + -7v + -2v2 + 3v2 + -2v2 = 0

Combine like terms: -2v2 + 3v2 = 1v2
2 + -7v + 1v2 + -2v2 = 0

Combine like terms: 1v2 + -2v2 = -1v2
2 + -7v + -1v2 = 0

Solving
2 + -7v + -1v2 = 0

Solving for variable 'v'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-2 + 7v + v2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 7v + 2 + v2 = 0 + 2

Reorder the terms:
-2 + 2 + 7v + v2 = 0 + 2

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

Combine like terms: 0 + 2 = 2
7v + v2 = 2

The v term is 7v.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7v + 12.25 + v2 = 2 + 12.25

Reorder the terms:
12.25 + 7v + v2 = 2 + 12.25

Combine like terms: 2 + 12.25 = 14.25
12.25 + 7v + v2 = 14.25

Factor a perfect square on the left side:
(v + 3.5)(v + 3.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(v + 3.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

v + 3.5 = 3.774917218 Simplifying v + 3.5 = 3.774917218 Reorder the terms: 3.5 + v = 3.774917218 Solving 3.5 + v = 3.774917218 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + v = 3.774917218 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = 3.774917218 + -3.5 v = 3.774917218 + -3.5 Combine like terms: 3.774917218 + -3.5 = 0.274917218 v = 0.274917218 Simplifying v = 0.274917218

Subproblem 2

v + 3.5 = -3.774917218 Simplifying v + 3.5 = -3.774917218 Reorder the terms: 3.5 + v = -3.774917218 Solving 3.5 + v = -3.774917218 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + v = -3.774917218 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = -3.774917218 + -3.5 v = -3.774917218 + -3.5 Combine like terms: -3.774917218 + -3.5 = -7.274917218 v = -7.274917218 Simplifying v = -7.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.274917218, -7.274917218}

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