v(3v-23)=-21

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Solution for v(3v-23)=-21 equation:


Simplifying
v(3v + -23) = -21

Reorder the terms:
v(-23 + 3v) = -21
(-23 * v + 3v * v) = -21
(-23v + 3v2) = -21

Solving
-23v + 3v2 = -21

Solving for variable 'v'.

Reorder the terms:
21 + -23v + 3v2 = -21 + 21

Combine like terms: -21 + 21 = 0
21 + -23v + 3v2 = 0

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

Divide each side by '3'.
7 + -7.666666667v + v2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -7.666666667v + -7 + v2 = 0 + -7

Reorder the terms:
7 + -7 + -7.666666667v + v2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -7.666666667v + v2 = 0 + -7
-7.666666667v + v2 = 0 + -7

Combine like terms: 0 + -7 = -7
-7.666666667v + v2 = -7

The v term is -7.666666667v.  Take half its coefficient (-3.833333334).
Square it (14.69444445) and add it to both sides.

Add '14.69444445' to each side of the equation.
-7.666666667v + 14.69444445 + v2 = -7 + 14.69444445

Reorder the terms:
14.69444445 + -7.666666667v + v2 = -7 + 14.69444445

Combine like terms: -7 + 14.69444445 = 7.69444445
14.69444445 + -7.666666667v + v2 = 7.69444445

Factor a perfect square on the left side:
(v + -3.833333334)(v + -3.833333334) = 7.69444445

Calculate the square root of the right side: 2.773886164

Break this problem into two subproblems by setting 
(v + -3.833333334) equal to 2.773886164 and -2.773886164.

Subproblem 1

v + -3.833333334 = 2.773886164 Simplifying v + -3.833333334 = 2.773886164 Reorder the terms: -3.833333334 + v = 2.773886164 Solving -3.833333334 + v = 2.773886164 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '3.833333334' to each side of the equation. -3.833333334 + 3.833333334 + v = 2.773886164 + 3.833333334 Combine like terms: -3.833333334 + 3.833333334 = 0.000000000 0.000000000 + v = 2.773886164 + 3.833333334 v = 2.773886164 + 3.833333334 Combine like terms: 2.773886164 + 3.833333334 = 6.607219498 v = 6.607219498 Simplifying v = 6.607219498

Subproblem 2

v + -3.833333334 = -2.773886164 Simplifying v + -3.833333334 = -2.773886164 Reorder the terms: -3.833333334 + v = -2.773886164 Solving -3.833333334 + v = -2.773886164 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '3.833333334' to each side of the equation. -3.833333334 + 3.833333334 + v = -2.773886164 + 3.833333334 Combine like terms: -3.833333334 + 3.833333334 = 0.000000000 0.000000000 + v = -2.773886164 + 3.833333334 v = -2.773886164 + 3.833333334 Combine like terms: -2.773886164 + 3.833333334 = 1.05944717 v = 1.05944717 Simplifying v = 1.05944717

Solution

The solution to the problem is based on the solutions from the subproblems. v = {6.607219498, 1.05944717}

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