2v-7=v^2-9

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Solution for 2v-7=v^2-9 equation:


Simplifying
2v + -7 = v2 + -9

Reorder the terms:
-7 + 2v = v2 + -9

Reorder the terms:
-7 + 2v = -9 + v2

Solving
-7 + 2v = -9 + v2

Solving for variable 'v'.

Reorder the terms:
-7 + 9 + 2v + -1v2 = -9 + v2 + 9 + -1v2

Combine like terms: -7 + 9 = 2
2 + 2v + -1v2 = -9 + v2 + 9 + -1v2

Reorder the terms:
2 + 2v + -1v2 = -9 + 9 + v2 + -1v2

Combine like terms: -9 + 9 = 0
2 + 2v + -1v2 = 0 + v2 + -1v2
2 + 2v + -1v2 = v2 + -1v2

Combine like terms: v2 + -1v2 = 0
2 + 2v + -1v2 = 0

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

Divide each side by '-1'.
-2 + -2v + v2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -2v + 2 + v2 = 0 + 2

Reorder the terms:
-2 + 2 + -2v + v2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -2v + v2 = 0 + 2
-2v + v2 = 0 + 2

Combine like terms: 0 + 2 = 2
-2v + v2 = 2

The v term is -2v.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2v + 1 + v2 = 2 + 1

Reorder the terms:
1 + -2v + v2 = 2 + 1

Combine like terms: 2 + 1 = 3
1 + -2v + v2 = 3

Factor a perfect square on the left side:
(v + -1)(v + -1) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(v + -1) equal to 1.732050808 and -1.732050808.

Subproblem 1

v + -1 = 1.732050808 Simplifying v + -1 = 1.732050808 Reorder the terms: -1 + v = 1.732050808 Solving -1 + v = 1.732050808 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + v = 1.732050808 + 1 Combine like terms: -1 + 1 = 0 0 + v = 1.732050808 + 1 v = 1.732050808 + 1 Combine like terms: 1.732050808 + 1 = 2.732050808 v = 2.732050808 Simplifying v = 2.732050808

Subproblem 2

v + -1 = -1.732050808 Simplifying v + -1 = -1.732050808 Reorder the terms: -1 + v = -1.732050808 Solving -1 + v = -1.732050808 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + v = -1.732050808 + 1 Combine like terms: -1 + 1 = 0 0 + v = -1.732050808 + 1 v = -1.732050808 + 1 Combine like terms: -1.732050808 + 1 = -0.732050808 v = -0.732050808 Simplifying v = -0.732050808

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.732050808, -0.732050808}

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