-v^2-7v+12=0

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Solution for -v^2-7v+12=0 equation:


Simplifying
-1v2 + -7v + 12 = 0

Reorder the terms:
12 + -7v + -1v2 = 0

Solving
12 + -7v + -1v2 = 0

Solving for variable 'v'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-12 + 7v + v2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 7v + 12 + v2 = 0 + 12

Reorder the terms:
-12 + 12 + 7v + v2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 7v + v2 = 0 + 12
7v + v2 = 0 + 12

Combine like terms: 0 + 12 = 12
7v + v2 = 12

The v term is 7v.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7v + 12.25 + v2 = 12 + 12.25

Reorder the terms:
12.25 + 7v + v2 = 12 + 12.25

Combine like terms: 12 + 12.25 = 24.25
12.25 + 7v + v2 = 24.25

Factor a perfect square on the left side:
(v + 3.5)(v + 3.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(v + 3.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

v + 3.5 = 4.924428901 Simplifying v + 3.5 = 4.924428901 Reorder the terms: 3.5 + v = 4.924428901 Solving 3.5 + v = 4.924428901 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + v = 4.924428901 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = 4.924428901 + -3.5 v = 4.924428901 + -3.5 Combine like terms: 4.924428901 + -3.5 = 1.424428901 v = 1.424428901 Simplifying v = 1.424428901

Subproblem 2

v + 3.5 = -4.924428901 Simplifying v + 3.5 = -4.924428901 Reorder the terms: 3.5 + v = -4.924428901 Solving 3.5 + v = -4.924428901 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + v = -4.924428901 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = -4.924428901 + -3.5 v = -4.924428901 + -3.5 Combine like terms: -4.924428901 + -3.5 = -8.424428901 v = -8.424428901 Simplifying v = -8.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.424428901, -8.424428901}

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