v^2-2v-18=-6

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Solution for v^2-2v-18=-6 equation:


Simplifying
v2 + -2v + -18 = -6

Reorder the terms:
-18 + -2v + v2 = -6

Solving
-18 + -2v + v2 = -6

Solving for variable 'v'.

Reorder the terms:
-18 + 6 + -2v + v2 = -6 + 6

Combine like terms: -18 + 6 = -12
-12 + -2v + v2 = -6 + 6

Combine like terms: -6 + 6 = 0
-12 + -2v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -2v + 12 + v2 = 0 + 12

Reorder the terms:
-12 + 12 + -2v + v2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -2v + v2 = 0 + 12
-2v + v2 = 0 + 12

Combine like terms: 0 + 12 = 12
-2v + v2 = 12

The v term is -2v.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2v + 1 + v2 = 12 + 1

Reorder the terms:
1 + -2v + v2 = 12 + 1

Combine like terms: 12 + 1 = 13
1 + -2v + v2 = 13

Factor a perfect square on the left side:
(v + -1)(v + -1) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(v + -1) equal to 3.605551275 and -3.605551275.

Subproblem 1

v + -1 = 3.605551275 Simplifying v + -1 = 3.605551275 Reorder the terms: -1 + v = 3.605551275 Solving -1 + v = 3.605551275 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + v = 3.605551275 + 1 Combine like terms: -1 + 1 = 0 0 + v = 3.605551275 + 1 v = 3.605551275 + 1 Combine like terms: 3.605551275 + 1 = 4.605551275 v = 4.605551275 Simplifying v = 4.605551275

Subproblem 2

v + -1 = -3.605551275 Simplifying v + -1 = -3.605551275 Reorder the terms: -1 + v = -3.605551275 Solving -1 + v = -3.605551275 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + v = -3.605551275 + 1 Combine like terms: -1 + 1 = 0 0 + v = -3.605551275 + 1 v = -3.605551275 + 1 Combine like terms: -3.605551275 + 1 = -2.605551275 v = -2.605551275 Simplifying v = -2.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. v = {4.605551275, -2.605551275}

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