v^2-41=4+18v

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Solution for v^2-41=4+18v equation:


Simplifying
v2 + -41 = 4 + 18v

Reorder the terms:
-41 + v2 = 4 + 18v

Solving
-41 + v2 = 4 + 18v

Solving for variable 'v'.

Reorder the terms:
-41 + -4 + -18v + v2 = 4 + 18v + -4 + -18v

Combine like terms: -41 + -4 = -45
-45 + -18v + v2 = 4 + 18v + -4 + -18v

Reorder the terms:
-45 + -18v + v2 = 4 + -4 + 18v + -18v

Combine like terms: 4 + -4 = 0
-45 + -18v + v2 = 0 + 18v + -18v
-45 + -18v + v2 = 18v + -18v

Combine like terms: 18v + -18v = 0
-45 + -18v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -18v + 45 + v2 = 0 + 45

Reorder the terms:
-45 + 45 + -18v + v2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -18v + v2 = 0 + 45
-18v + v2 = 0 + 45

Combine like terms: 0 + 45 = 45
-18v + v2 = 45

The v term is -18v.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18v + 81 + v2 = 45 + 81

Reorder the terms:
81 + -18v + v2 = 45 + 81

Combine like terms: 45 + 81 = 126
81 + -18v + v2 = 126

Factor a perfect square on the left side:
(v + -9)(v + -9) = 126

Calculate the square root of the right side: 11.22497216

Break this problem into two subproblems by setting 
(v + -9) equal to 11.22497216 and -11.22497216.

Subproblem 1

v + -9 = 11.22497216 Simplifying v + -9 = 11.22497216 Reorder the terms: -9 + v = 11.22497216 Solving -9 + v = 11.22497216 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + v = 11.22497216 + 9 Combine like terms: -9 + 9 = 0 0 + v = 11.22497216 + 9 v = 11.22497216 + 9 Combine like terms: 11.22497216 + 9 = 20.22497216 v = 20.22497216 Simplifying v = 20.22497216

Subproblem 2

v + -9 = -11.22497216 Simplifying v + -9 = -11.22497216 Reorder the terms: -9 + v = -11.22497216 Solving -9 + v = -11.22497216 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + v = -11.22497216 + 9 Combine like terms: -9 + 9 = 0 0 + v = -11.22497216 + 9 v = -11.22497216 + 9 Combine like terms: -11.22497216 + 9 = -2.22497216 v = -2.22497216 Simplifying v = -2.22497216

Solution

The solution to the problem is based on the solutions from the subproblems. v = {20.22497216, -2.22497216}

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