(v+7)(v-8)=2

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Solution for (v+7)(v-8)=2 equation:


Simplifying
(v + 7)(v + -8) = 2

Reorder the terms:
(7 + v)(v + -8) = 2

Reorder the terms:
(7 + v)(-8 + v) = 2

Multiply (7 + v) * (-8 + v)
(7(-8 + v) + v(-8 + v)) = 2
((-8 * 7 + v * 7) + v(-8 + v)) = 2
((-56 + 7v) + v(-8 + v)) = 2
(-56 + 7v + (-8 * v + v * v)) = 2
(-56 + 7v + (-8v + v2)) = 2

Combine like terms: 7v + -8v = -1v
(-56 + -1v + v2) = 2

Solving
-56 + -1v + v2 = 2

Solving for variable 'v'.

Reorder the terms:
-56 + -2 + -1v + v2 = 2 + -2

Combine like terms: -56 + -2 = -58
-58 + -1v + v2 = 2 + -2

Combine like terms: 2 + -2 = 0
-58 + -1v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '58' to each side of the equation.
-58 + -1v + 58 + v2 = 0 + 58

Reorder the terms:
-58 + 58 + -1v + v2 = 0 + 58

Combine like terms: -58 + 58 = 0
0 + -1v + v2 = 0 + 58
-1v + v2 = 0 + 58

Combine like terms: 0 + 58 = 58
-1v + v2 = 58

The v term is -1v.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1v + 0.25 + v2 = 58 + 0.25

Reorder the terms:
0.25 + -1v + v2 = 58 + 0.25

Combine like terms: 58 + 0.25 = 58.25
0.25 + -1v + v2 = 58.25

Factor a perfect square on the left side:
(v + -0.5)(v + -0.5) = 58.25

Calculate the square root of the right side: 7.632168761

Break this problem into two subproblems by setting 
(v + -0.5) equal to 7.632168761 and -7.632168761.

Subproblem 1

v + -0.5 = 7.632168761 Simplifying v + -0.5 = 7.632168761 Reorder the terms: -0.5 + v = 7.632168761 Solving -0.5 + v = 7.632168761 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = 7.632168761 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = 7.632168761 + 0.5 v = 7.632168761 + 0.5 Combine like terms: 7.632168761 + 0.5 = 8.132168761 v = 8.132168761 Simplifying v = 8.132168761

Subproblem 2

v + -0.5 = -7.632168761 Simplifying v + -0.5 = -7.632168761 Reorder the terms: -0.5 + v = -7.632168761 Solving -0.5 + v = -7.632168761 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + v = -7.632168761 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = -7.632168761 + 0.5 v = -7.632168761 + 0.5 Combine like terms: -7.632168761 + 0.5 = -7.132168761 v = -7.132168761 Simplifying v = -7.132168761

Solution

The solution to the problem is based on the solutions from the subproblems. v = {8.132168761, -7.132168761}

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