5v^2-35v-28=0

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Solution for 5v^2-35v-28=0 equation:


Simplifying
5v2 + -35v + -28 = 0

Reorder the terms:
-28 + -35v + 5v2 = 0

Solving
-28 + -35v + 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'.
-5.6 + -7v + v2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + -7v + 5.6 + v2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + -7v + v2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + -7v + v2 = 0 + 5.6
-7v + v2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
-7v + v2 = 5.6

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 = 5.6 + 12.25

Reorder the terms:
12.25 + -7v + v2 = 5.6 + 12.25

Combine like terms: 5.6 + 12.25 = 17.85
12.25 + -7v + v2 = 17.85

Factor a perfect square on the left side:
(v + -3.5)(v + -3.5) = 17.85

Calculate the square root of the right side: 4.224926035

Break this problem into two subproblems by setting 
(v + -3.5) equal to 4.224926035 and -4.224926035.

Subproblem 1

v + -3.5 = 4.224926035 Simplifying v + -3.5 = 4.224926035 Reorder the terms: -3.5 + v = 4.224926035 Solving -3.5 + v = 4.224926035 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 = 4.224926035 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + v = 4.224926035 + 3.5 v = 4.224926035 + 3.5 Combine like terms: 4.224926035 + 3.5 = 7.724926035 v = 7.724926035 Simplifying v = 7.724926035

Subproblem 2

v + -3.5 = -4.224926035 Simplifying v + -3.5 = -4.224926035 Reorder the terms: -3.5 + v = -4.224926035 Solving -3.5 + v = -4.224926035 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 = -4.224926035 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + v = -4.224926035 + 3.5 v = -4.224926035 + 3.5 Combine like terms: -4.224926035 + 3.5 = -0.724926035 v = -0.724926035 Simplifying v = -0.724926035

Solution

The solution to the problem is based on the solutions from the subproblems. v = {7.724926035, -0.724926035}

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