v^2-6v=42

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Solution for v^2-6v=42 equation:


Simplifying
v2 + -6v = 42

Reorder the terms:
-6v + v2 = 42

Solving
-6v + v2 = 42

Solving for variable 'v'.

Reorder the terms:
-42 + -6v + v2 = 42 + -42

Combine like terms: 42 + -42 = 0
-42 + -6v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + -6v + 42 + v2 = 0 + 42

Reorder the terms:
-42 + 42 + -6v + v2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + -6v + v2 = 0 + 42
-6v + v2 = 0 + 42

Combine like terms: 0 + 42 = 42
-6v + v2 = 42

The v term is -6v.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6v + 9 + v2 = 42 + 9

Reorder the terms:
9 + -6v + v2 = 42 + 9

Combine like terms: 42 + 9 = 51
9 + -6v + v2 = 51

Factor a perfect square on the left side:
(v + -3)(v + -3) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(v + -3) equal to 7.141428429 and -7.141428429.

Subproblem 1

v + -3 = 7.141428429 Simplifying v + -3 = 7.141428429 Reorder the terms: -3 + v = 7.141428429 Solving -3 + v = 7.141428429 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + v = 7.141428429 + 3 Combine like terms: -3 + 3 = 0 0 + v = 7.141428429 + 3 v = 7.141428429 + 3 Combine like terms: 7.141428429 + 3 = 10.141428429 v = 10.141428429 Simplifying v = 10.141428429

Subproblem 2

v + -3 = -7.141428429 Simplifying v + -3 = -7.141428429 Reorder the terms: -3 + v = -7.141428429 Solving -3 + v = -7.141428429 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + v = -7.141428429 + 3 Combine like terms: -3 + 3 = 0 0 + v = -7.141428429 + 3 v = -7.141428429 + 3 Combine like terms: -7.141428429 + 3 = -4.141428429 v = -4.141428429 Simplifying v = -4.141428429

Solution

The solution to the problem is based on the solutions from the subproblems. v = {10.141428429, -4.141428429}

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