2v^2+7v-3=v^2+25

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Solution for 2v^2+7v-3=v^2+25 equation:


Simplifying
2v2 + 7v + -3 = v2 + 25

Reorder the terms:
-3 + 7v + 2v2 = v2 + 25

Reorder the terms:
-3 + 7v + 2v2 = 25 + v2

Solving
-3 + 7v + 2v2 = 25 + v2

Solving for variable 'v'.

Reorder the terms:
-3 + -25 + 7v + 2v2 + -1v2 = 25 + v2 + -25 + -1v2

Combine like terms: -3 + -25 = -28
-28 + 7v + 2v2 + -1v2 = 25 + v2 + -25 + -1v2

Combine like terms: 2v2 + -1v2 = 1v2
-28 + 7v + 1v2 = 25 + v2 + -25 + -1v2

Reorder the terms:
-28 + 7v + 1v2 = 25 + -25 + v2 + -1v2

Combine like terms: 25 + -25 = 0
-28 + 7v + 1v2 = 0 + v2 + -1v2
-28 + 7v + 1v2 = v2 + -1v2

Combine like terms: v2 + -1v2 = 0
-28 + 7v + 1v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 7v + 28 + v2 = 0 + 28

Reorder the terms:
-28 + 28 + 7v + v2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 7v + v2 = 0 + 28
7v + v2 = 0 + 28

Combine like terms: 0 + 28 = 28
7v + v2 = 28

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 = 28 + 12.25

Reorder the terms:
12.25 + 7v + v2 = 28 + 12.25

Combine like terms: 28 + 12.25 = 40.25
12.25 + 7v + v2 = 40.25

Factor a perfect square on the left side:
(v + 3.5)(v + 3.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(v + 3.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

v + 3.5 = 6.34428877 Simplifying v + 3.5 = 6.34428877 Reorder the terms: 3.5 + v = 6.34428877 Solving 3.5 + v = 6.34428877 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 = 6.34428877 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = 6.34428877 + -3.5 v = 6.34428877 + -3.5 Combine like terms: 6.34428877 + -3.5 = 2.84428877 v = 2.84428877 Simplifying v = 2.84428877

Subproblem 2

v + 3.5 = -6.34428877 Simplifying v + 3.5 = -6.34428877 Reorder the terms: 3.5 + v = -6.34428877 Solving 3.5 + v = -6.34428877 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 = -6.34428877 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = -6.34428877 + -3.5 v = -6.34428877 + -3.5 Combine like terms: -6.34428877 + -3.5 = -9.84428877 v = -9.84428877 Simplifying v = -9.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.84428877, -9.84428877}

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