v^2-10v-28=9

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Solution for v^2-10v-28=9 equation:


Simplifying
v2 + -10v + -28 = 9

Reorder the terms:
-28 + -10v + v2 = 9

Solving
-28 + -10v + v2 = 9

Solving for variable 'v'.

Reorder the terms:
-28 + -9 + -10v + v2 = 9 + -9

Combine like terms: -28 + -9 = -37
-37 + -10v + v2 = 9 + -9

Combine like terms: 9 + -9 = 0
-37 + -10v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + -10v + 37 + v2 = 0 + 37

Reorder the terms:
-37 + 37 + -10v + v2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + -10v + v2 = 0 + 37
-10v + v2 = 0 + 37

Combine like terms: 0 + 37 = 37
-10v + v2 = 37

The v term is -10v.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10v + 25 + v2 = 37 + 25

Reorder the terms:
25 + -10v + v2 = 37 + 25

Combine like terms: 37 + 25 = 62
25 + -10v + v2 = 62

Factor a perfect square on the left side:
(v + -5)(v + -5) = 62

Calculate the square root of the right side: 7.874007874

Break this problem into two subproblems by setting 
(v + -5) equal to 7.874007874 and -7.874007874.

Subproblem 1

v + -5 = 7.874007874 Simplifying v + -5 = 7.874007874 Reorder the terms: -5 + v = 7.874007874 Solving -5 + v = 7.874007874 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + v = 7.874007874 + 5 Combine like terms: -5 + 5 = 0 0 + v = 7.874007874 + 5 v = 7.874007874 + 5 Combine like terms: 7.874007874 + 5 = 12.874007874 v = 12.874007874 Simplifying v = 12.874007874

Subproblem 2

v + -5 = -7.874007874 Simplifying v + -5 = -7.874007874 Reorder the terms: -5 + v = -7.874007874 Solving -5 + v = -7.874007874 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + v = -7.874007874 + 5 Combine like terms: -5 + 5 = 0 0 + v = -7.874007874 + 5 v = -7.874007874 + 5 Combine like terms: -7.874007874 + 5 = -2.874007874 v = -2.874007874 Simplifying v = -2.874007874

Solution

The solution to the problem is based on the solutions from the subproblems. v = {12.874007874, -2.874007874}

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