(-6v^2+8v+9)-(9v^2+12v-4)=

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Solution for (-6v^2+8v+9)-(9v^2+12v-4)= equation:


Simplifying
(-6v2 + 8v + 9) + -1(9v2 + 12v + -4) = 0

Reorder the terms:
(9 + 8v + -6v2) + -1(9v2 + 12v + -4) = 0

Remove parenthesis around (9 + 8v + -6v2)
9 + 8v + -6v2 + -1(9v2 + 12v + -4) = 0

Reorder the terms:
9 + 8v + -6v2 + -1(-4 + 12v + 9v2) = 0
9 + 8v + -6v2 + (-4 * -1 + 12v * -1 + 9v2 * -1) = 0
9 + 8v + -6v2 + (4 + -12v + -9v2) = 0

Reorder the terms:
9 + 4 + 8v + -12v + -6v2 + -9v2 = 0

Combine like terms: 9 + 4 = 13
13 + 8v + -12v + -6v2 + -9v2 = 0

Combine like terms: 8v + -12v = -4v
13 + -4v + -6v2 + -9v2 = 0

Combine like terms: -6v2 + -9v2 = -15v2
13 + -4v + -15v2 = 0

Solving
13 + -4v + -15v2 = 0

Solving for variable 'v'.

Begin completing the square.  Divide all terms by
-15 the coefficient of the squared term: 

Divide each side by '-15'.
-0.8666666667 + 0.2666666667v + v2 = 0

Move the constant term to the right:

Add '0.8666666667' to each side of the equation.
-0.8666666667 + 0.2666666667v + 0.8666666667 + v2 = 0 + 0.8666666667

Reorder the terms:
-0.8666666667 + 0.8666666667 + 0.2666666667v + v2 = 0 + 0.8666666667

Combine like terms: -0.8666666667 + 0.8666666667 = 0.0000000000
0.0000000000 + 0.2666666667v + v2 = 0 + 0.8666666667
0.2666666667v + v2 = 0 + 0.8666666667

Combine like terms: 0 + 0.8666666667 = 0.8666666667
0.2666666667v + v2 = 0.8666666667

The v term is 0.2666666667v.  Take half its coefficient (0.1333333334).
Square it (0.01777777780) and add it to both sides.

Add '0.01777777780' to each side of the equation.
0.2666666667v + 0.01777777780 + v2 = 0.8666666667 + 0.01777777780

Reorder the terms:
0.01777777780 + 0.2666666667v + v2 = 0.8666666667 + 0.01777777780

Combine like terms: 0.8666666667 + 0.01777777780 = 0.8844444445
0.01777777780 + 0.2666666667v + v2 = 0.8844444445

Factor a perfect square on the left side:
(v + 0.1333333334)(v + 0.1333333334) = 0.8844444445

Calculate the square root of the right side: 0.940449065

Break this problem into two subproblems by setting 
(v + 0.1333333334) equal to 0.940449065 and -0.940449065.

Subproblem 1

v + 0.1333333334 = 0.940449065 Simplifying v + 0.1333333334 = 0.940449065 Reorder the terms: 0.1333333334 + v = 0.940449065 Solving 0.1333333334 + v = 0.940449065 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.1333333334' to each side of the equation. 0.1333333334 + -0.1333333334 + v = 0.940449065 + -0.1333333334 Combine like terms: 0.1333333334 + -0.1333333334 = 0.0000000000 0.0000000000 + v = 0.940449065 + -0.1333333334 v = 0.940449065 + -0.1333333334 Combine like terms: 0.940449065 + -0.1333333334 = 0.8071157316 v = 0.8071157316 Simplifying v = 0.8071157316

Subproblem 2

v + 0.1333333334 = -0.940449065 Simplifying v + 0.1333333334 = -0.940449065 Reorder the terms: 0.1333333334 + v = -0.940449065 Solving 0.1333333334 + v = -0.940449065 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-0.1333333334' to each side of the equation. 0.1333333334 + -0.1333333334 + v = -0.940449065 + -0.1333333334 Combine like terms: 0.1333333334 + -0.1333333334 = 0.0000000000 0.0000000000 + v = -0.940449065 + -0.1333333334 v = -0.940449065 + -0.1333333334 Combine like terms: -0.940449065 + -0.1333333334 = -1.0737823984 v = -1.0737823984 Simplifying v = -1.0737823984

Solution

The solution to the problem is based on the solutions from the subproblems. v = {0.8071157316, -1.0737823984}

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