-5v^2+5v+12=0

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Solution for -5v^2+5v+12=0 equation:


Simplifying
-5v2 + 5v + 12 = 0

Reorder the terms:
12 + 5v + -5v2 = 0

Solving
12 + 5v + -5v2 = 0

Solving for variable 'v'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-2.4 + -1v + v2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -1v + 2.4 + v2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -1v + v2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -1v + v2 = 0 + 2.4
-1v + v2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-1v + v2 = 2.4

The v term is -1v.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1v + 0.25 + v2 = 2.4 + 0.25

Reorder the terms:
0.25 + -1v + v2 = 2.4 + 0.25

Combine like terms: 2.4 + 0.25 = 2.65
0.25 + -1v + v2 = 2.65

Factor a perfect square on the left side:
(v + -0.5)(v + -0.5) = 2.65

Calculate the square root of the right side: 1.62788206

Break this problem into two subproblems by setting 
(v + -0.5) equal to 1.62788206 and -1.62788206.

Subproblem 1

v + -0.5 = 1.62788206 Simplifying v + -0.5 = 1.62788206 Reorder the terms: -0.5 + v = 1.62788206 Solving -0.5 + v = 1.62788206 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = 1.62788206 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = 1.62788206 + 0.5 v = 1.62788206 + 0.5 Combine like terms: 1.62788206 + 0.5 = 2.12788206 v = 2.12788206 Simplifying v = 2.12788206

Subproblem 2

v + -0.5 = -1.62788206 Simplifying v + -0.5 = -1.62788206 Reorder the terms: -0.5 + v = -1.62788206 Solving -0.5 + v = -1.62788206 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = -1.62788206 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = -1.62788206 + 0.5 v = -1.62788206 + 0.5 Combine like terms: -1.62788206 + 0.5 = -1.12788206 v = -1.12788206 Simplifying v = -1.12788206

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.12788206, -1.12788206}

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