2v^2=7v-4

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Solution for 2v^2=7v-4 equation:


Simplifying
2v2 = 7v + -4

Reorder the terms:
2v2 = -4 + 7v

Solving
2v2 = -4 + 7v

Solving for variable 'v'.

Reorder the terms:
4 + -7v + 2v2 = -4 + 7v + 4 + -7v

Reorder the terms:
4 + -7v + 2v2 = -4 + 4 + 7v + -7v

Combine like terms: -4 + 4 = 0
4 + -7v + 2v2 = 0 + 7v + -7v
4 + -7v + 2v2 = 7v + -7v

Combine like terms: 7v + -7v = 0
4 + -7v + 2v2 = 0

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

Divide each side by '2'.
2 + -3.5v + v2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -3.5v + -2 + v2 = 0 + -2

Reorder the terms:
2 + -2 + -3.5v + v2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3.5v + v2 = 0 + -2
-3.5v + v2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3.5v + v2 = -2

The v term is -3.5v.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5v + 3.0625 + v2 = -2 + 3.0625

Reorder the terms:
3.0625 + -3.5v + v2 = -2 + 3.0625

Combine like terms: -2 + 3.0625 = 1.0625
3.0625 + -3.5v + v2 = 1.0625

Factor a perfect square on the left side:
(v + -1.75)(v + -1.75) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(v + -1.75) equal to 1.030776406 and -1.030776406.

Subproblem 1

v + -1.75 = 1.030776406 Simplifying v + -1.75 = 1.030776406 Reorder the terms: -1.75 + v = 1.030776406 Solving -1.75 + v = 1.030776406 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + v = 1.030776406 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + v = 1.030776406 + 1.75 v = 1.030776406 + 1.75 Combine like terms: 1.030776406 + 1.75 = 2.780776406 v = 2.780776406 Simplifying v = 2.780776406

Subproblem 2

v + -1.75 = -1.030776406 Simplifying v + -1.75 = -1.030776406 Reorder the terms: -1.75 + v = -1.030776406 Solving -1.75 + v = -1.030776406 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + v = -1.030776406 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + v = -1.030776406 + 1.75 v = -1.030776406 + 1.75 Combine like terms: -1.030776406 + 1.75 = 0.719223594 v = 0.719223594 Simplifying v = 0.719223594

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.780776406, 0.719223594}

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