v^2+14v=28

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Solution for v^2+14v=28 equation:


Simplifying
v2 + 14v = 28

Reorder the terms:
14v + v2 = 28

Solving
14v + v2 = 28

Solving for variable 'v'.

Reorder the terms:
-28 + 14v + v2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 14v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 14v + 28 + v2 = 0 + 28

Reorder the terms:
-28 + 28 + 14v + v2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 14v + v2 = 0 + 28
14v + v2 = 0 + 28

Combine like terms: 0 + 28 = 28
14v + v2 = 28

The v term is 14v.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14v + 49 + v2 = 28 + 49

Reorder the terms:
49 + 14v + v2 = 28 + 49

Combine like terms: 28 + 49 = 77
49 + 14v + v2 = 77

Factor a perfect square on the left side:
(v + 7)(v + 7) = 77

Calculate the square root of the right side: 8.774964387

Break this problem into two subproblems by setting 
(v + 7) equal to 8.774964387 and -8.774964387.

Subproblem 1

v + 7 = 8.774964387 Simplifying v + 7 = 8.774964387 Reorder the terms: 7 + v = 8.774964387 Solving 7 + v = 8.774964387 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + v = 8.774964387 + -7 Combine like terms: 7 + -7 = 0 0 + v = 8.774964387 + -7 v = 8.774964387 + -7 Combine like terms: 8.774964387 + -7 = 1.774964387 v = 1.774964387 Simplifying v = 1.774964387

Subproblem 2

v + 7 = -8.774964387 Simplifying v + 7 = -8.774964387 Reorder the terms: 7 + v = -8.774964387 Solving 7 + v = -8.774964387 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + v = -8.774964387 + -7 Combine like terms: 7 + -7 = 0 0 + v = -8.774964387 + -7 v = -8.774964387 + -7 Combine like terms: -8.774964387 + -7 = -15.774964387 v = -15.774964387 Simplifying v = -15.774964387

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.774964387, -15.774964387}

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