3(7+8v)+4v(v+7)=

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Solution for 3(7+8v)+4v(v+7)= equation:


Simplifying
3(7 + 8v) + 4v(v + 7) = 0
(7 * 3 + 8v * 3) + 4v(v + 7) = 0
(21 + 24v) + 4v(v + 7) = 0

Reorder the terms:
21 + 24v + 4v(7 + v) = 0
21 + 24v + (7 * 4v + v * 4v) = 0
21 + 24v + (28v + 4v2) = 0

Combine like terms: 24v + 28v = 52v
21 + 52v + 4v2 = 0

Solving
21 + 52v + 4v2 = 0

Solving for variable 'v'.

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

Divide each side by '4'.
5.25 + 13v + v2 = 0

Move the constant term to the right:

Add '-5.25' to each side of the equation.
5.25 + 13v + -5.25 + v2 = 0 + -5.25

Reorder the terms:
5.25 + -5.25 + 13v + v2 = 0 + -5.25

Combine like terms: 5.25 + -5.25 = 0.00
0.00 + 13v + v2 = 0 + -5.25
13v + v2 = 0 + -5.25

Combine like terms: 0 + -5.25 = -5.25
13v + v2 = -5.25

The v term is 13v.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13v + 42.25 + v2 = -5.25 + 42.25

Reorder the terms:
42.25 + 13v + v2 = -5.25 + 42.25

Combine like terms: -5.25 + 42.25 = 37
42.25 + 13v + v2 = 37

Factor a perfect square on the left side:
(v + 6.5)(v + 6.5) = 37

Calculate the square root of the right side: 6.08276253

Break this problem into two subproblems by setting 
(v + 6.5) equal to 6.08276253 and -6.08276253.

Subproblem 1

v + 6.5 = 6.08276253 Simplifying v + 6.5 = 6.08276253 Reorder the terms: 6.5 + v = 6.08276253 Solving 6.5 + v = 6.08276253 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + v = 6.08276253 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + v = 6.08276253 + -6.5 v = 6.08276253 + -6.5 Combine like terms: 6.08276253 + -6.5 = -0.41723747 v = -0.41723747 Simplifying v = -0.41723747

Subproblem 2

v + 6.5 = -6.08276253 Simplifying v + 6.5 = -6.08276253 Reorder the terms: 6.5 + v = -6.08276253 Solving 6.5 + v = -6.08276253 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + v = -6.08276253 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + v = -6.08276253 + -6.5 v = -6.08276253 + -6.5 Combine like terms: -6.08276253 + -6.5 = -12.58276253 v = -12.58276253 Simplifying v = -12.58276253

Solution

The solution to the problem is based on the solutions from the subproblems. v = {-0.41723747, -12.58276253}

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