v^2+4v-56=0

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Solution for v^2+4v-56=0 equation:


Simplifying
v2 + 4v + -56 = 0

Reorder the terms:
-56 + 4v + v2 = 0

Solving
-56 + 4v + v2 = 0

Solving for variable 'v'.

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + 4v + 56 + v2 = 0 + 56

Reorder the terms:
-56 + 56 + 4v + v2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + 4v + v2 = 0 + 56
4v + v2 = 0 + 56

Combine like terms: 0 + 56 = 56
4v + v2 = 56

The v term is 4v.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4v + 4 + v2 = 56 + 4

Reorder the terms:
4 + 4v + v2 = 56 + 4

Combine like terms: 56 + 4 = 60
4 + 4v + v2 = 60

Factor a perfect square on the left side:
(v + 2)(v + 2) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(v + 2) equal to 7.745966692 and -7.745966692.

Subproblem 1

v + 2 = 7.745966692 Simplifying v + 2 = 7.745966692 Reorder the terms: 2 + v = 7.745966692 Solving 2 + v = 7.745966692 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + v = 7.745966692 + -2 Combine like terms: 2 + -2 = 0 0 + v = 7.745966692 + -2 v = 7.745966692 + -2 Combine like terms: 7.745966692 + -2 = 5.745966692 v = 5.745966692 Simplifying v = 5.745966692

Subproblem 2

v + 2 = -7.745966692 Simplifying v + 2 = -7.745966692 Reorder the terms: 2 + v = -7.745966692 Solving 2 + v = -7.745966692 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + v = -7.745966692 + -2 Combine like terms: 2 + -2 = 0 0 + v = -7.745966692 + -2 v = -7.745966692 + -2 Combine like terms: -7.745966692 + -2 = -9.745966692 v = -9.745966692 Simplifying v = -9.745966692

Solution

The solution to the problem is based on the solutions from the subproblems. v = {5.745966692, -9.745966692}

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