0=v^2+7v-10

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Solution for 0=v^2+7v-10 equation:


Simplifying
0 = v2 + 7v + -10

Reorder the terms:
0 = -10 + 7v + v2

Solving
0 = -10 + 7v + v2

Solving for variable 'v'.

Combine like terms: 0 + 10 = 10
10 + -7v + -1v2 = -10 + 7v + v2 + 10 + -7v + -1v2

Reorder the terms:
10 + -7v + -1v2 = -10 + 10 + 7v + -7v + v2 + -1v2

Combine like terms: -10 + 10 = 0
10 + -7v + -1v2 = 0 + 7v + -7v + v2 + -1v2
10 + -7v + -1v2 = 7v + -7v + v2 + -1v2

Combine like terms: 7v + -7v = 0
10 + -7v + -1v2 = 0 + v2 + -1v2
10 + -7v + -1v2 = v2 + -1v2

Combine like terms: v2 + -1v2 = 0
10 + -7v + -1v2 = 0

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

Divide each side by '-1'.
-10 + 7v + v2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 7v + 10 + v2 = 0 + 10

Reorder the terms:
-10 + 10 + 7v + v2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 7v + v2 = 0 + 10
7v + v2 = 0 + 10

Combine like terms: 0 + 10 = 10
7v + v2 = 10

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 = 10 + 12.25

Reorder the terms:
12.25 + 7v + v2 = 10 + 12.25

Combine like terms: 10 + 12.25 = 22.25
12.25 + 7v + v2 = 22.25

Factor a perfect square on the left side:
(v + 3.5)(v + 3.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(v + 3.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

v + 3.5 = 4.716990566 Simplifying v + 3.5 = 4.716990566 Reorder the terms: 3.5 + v = 4.716990566 Solving 3.5 + v = 4.716990566 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 = 4.716990566 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = 4.716990566 + -3.5 v = 4.716990566 + -3.5 Combine like terms: 4.716990566 + -3.5 = 1.216990566 v = 1.216990566 Simplifying v = 1.216990566

Subproblem 2

v + 3.5 = -4.716990566 Simplifying v + 3.5 = -4.716990566 Reorder the terms: 3.5 + v = -4.716990566 Solving 3.5 + v = -4.716990566 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 = -4.716990566 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + v = -4.716990566 + -3.5 v = -4.716990566 + -3.5 Combine like terms: -4.716990566 + -3.5 = -8.216990566 v = -8.216990566 Simplifying v = -8.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.216990566, -8.216990566}

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