v^2-8v=43

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Solution for v^2-8v=43 equation:


Simplifying
v2 + -8v = 43

Reorder the terms:
-8v + v2 = 43

Solving
-8v + v2 = 43

Solving for variable 'v'.

Reorder the terms:
-43 + -8v + v2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + -8v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + -8v + 43 + v2 = 0 + 43

Reorder the terms:
-43 + 43 + -8v + v2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + -8v + v2 = 0 + 43
-8v + v2 = 0 + 43

Combine like terms: 0 + 43 = 43
-8v + v2 = 43

The v term is -8v.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8v + 16 + v2 = 43 + 16

Reorder the terms:
16 + -8v + v2 = 43 + 16

Combine like terms: 43 + 16 = 59
16 + -8v + v2 = 59

Factor a perfect square on the left side:
(v + -4)(v + -4) = 59

Calculate the square root of the right side: 7.681145748

Break this problem into two subproblems by setting 
(v + -4) equal to 7.681145748 and -7.681145748.

Subproblem 1

v + -4 = 7.681145748 Simplifying v + -4 = 7.681145748 Reorder the terms: -4 + v = 7.681145748 Solving -4 + v = 7.681145748 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + v = 7.681145748 + 4 Combine like terms: -4 + 4 = 0 0 + v = 7.681145748 + 4 v = 7.681145748 + 4 Combine like terms: 7.681145748 + 4 = 11.681145748 v = 11.681145748 Simplifying v = 11.681145748

Subproblem 2

v + -4 = -7.681145748 Simplifying v + -4 = -7.681145748 Reorder the terms: -4 + v = -7.681145748 Solving -4 + v = -7.681145748 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + v = -7.681145748 + 4 Combine like terms: -4 + 4 = 0 0 + v = -7.681145748 + 4 v = -7.681145748 + 4 Combine like terms: -7.681145748 + 4 = -3.681145748 v = -3.681145748 Simplifying v = -3.681145748

Solution

The solution to the problem is based on the solutions from the subproblems. v = {11.681145748, -3.681145748}

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