v^2+8v-64=-4

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Solution for v^2+8v-64=-4 equation:


Simplifying
v2 + 8v + -64 = -4

Reorder the terms:
-64 + 8v + v2 = -4

Solving
-64 + 8v + v2 = -4

Solving for variable 'v'.

Reorder the terms:
-64 + 4 + 8v + v2 = -4 + 4

Combine like terms: -64 + 4 = -60
-60 + 8v + v2 = -4 + 4

Combine like terms: -4 + 4 = 0
-60 + 8v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 8v + 60 + v2 = 0 + 60

Reorder the terms:
-60 + 60 + 8v + v2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 8v + v2 = 0 + 60
8v + v2 = 0 + 60

Combine like terms: 0 + 60 = 60
8v + v2 = 60

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 = 60 + 16

Reorder the terms:
16 + 8v + v2 = 60 + 16

Combine like terms: 60 + 16 = 76
16 + 8v + v2 = 76

Factor a perfect square on the left side:
(v + 4)(v + 4) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(v + 4) equal to 8.717797887 and -8.717797887.

Subproblem 1

v + 4 = 8.717797887 Simplifying v + 4 = 8.717797887 Reorder the terms: 4 + v = 8.717797887 Solving 4 + v = 8.717797887 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 = 8.717797887 + -4 Combine like terms: 4 + -4 = 0 0 + v = 8.717797887 + -4 v = 8.717797887 + -4 Combine like terms: 8.717797887 + -4 = 4.717797887 v = 4.717797887 Simplifying v = 4.717797887

Subproblem 2

v + 4 = -8.717797887 Simplifying v + 4 = -8.717797887 Reorder the terms: 4 + v = -8.717797887 Solving 4 + v = -8.717797887 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 = -8.717797887 + -4 Combine like terms: 4 + -4 = 0 0 + v = -8.717797887 + -4 v = -8.717797887 + -4 Combine like terms: -8.717797887 + -4 = -12.717797887 v = -12.717797887 Simplifying v = -12.717797887

Solution

The solution to the problem is based on the solutions from the subproblems. v = {4.717797887, -12.717797887}

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