2v^2+15v+18=v^2+36

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Solution for 2v^2+15v+18=v^2+36 equation:


Simplifying
2v2 + 15v + 18 = v2 + 36

Reorder the terms:
18 + 15v + 2v2 = v2 + 36

Reorder the terms:
18 + 15v + 2v2 = 36 + v2

Solving
18 + 15v + 2v2 = 36 + v2

Solving for variable 'v'.

Reorder the terms:
18 + -36 + 15v + 2v2 + -1v2 = 36 + v2 + -36 + -1v2

Combine like terms: 18 + -36 = -18
-18 + 15v + 2v2 + -1v2 = 36 + v2 + -36 + -1v2

Combine like terms: 2v2 + -1v2 = 1v2
-18 + 15v + 1v2 = 36 + v2 + -36 + -1v2

Reorder the terms:
-18 + 15v + 1v2 = 36 + -36 + v2 + -1v2

Combine like terms: 36 + -36 = 0
-18 + 15v + 1v2 = 0 + v2 + -1v2
-18 + 15v + 1v2 = v2 + -1v2

Combine like terms: v2 + -1v2 = 0
-18 + 15v + 1v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 15v + 18 + v2 = 0 + 18

Reorder the terms:
-18 + 18 + 15v + v2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 15v + v2 = 0 + 18
15v + v2 = 0 + 18

Combine like terms: 0 + 18 = 18
15v + v2 = 18

The v term is 15v.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15v + 56.25 + v2 = 18 + 56.25

Reorder the terms:
56.25 + 15v + v2 = 18 + 56.25

Combine like terms: 18 + 56.25 = 74.25
56.25 + 15v + v2 = 74.25

Factor a perfect square on the left side:
(v + 7.5)(v + 7.5) = 74.25

Calculate the square root of the right side: 8.61684397

Break this problem into two subproblems by setting 
(v + 7.5) equal to 8.61684397 and -8.61684397.

Subproblem 1

v + 7.5 = 8.61684397 Simplifying v + 7.5 = 8.61684397 Reorder the terms: 7.5 + v = 8.61684397 Solving 7.5 + v = 8.61684397 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + v = 8.61684397 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + v = 8.61684397 + -7.5 v = 8.61684397 + -7.5 Combine like terms: 8.61684397 + -7.5 = 1.11684397 v = 1.11684397 Simplifying v = 1.11684397

Subproblem 2

v + 7.5 = -8.61684397 Simplifying v + 7.5 = -8.61684397 Reorder the terms: 7.5 + v = -8.61684397 Solving 7.5 + v = -8.61684397 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + v = -8.61684397 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + v = -8.61684397 + -7.5 v = -8.61684397 + -7.5 Combine like terms: -8.61684397 + -7.5 = -16.11684397 v = -16.11684397 Simplifying v = -16.11684397

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.11684397, -16.11684397}

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