(v-9)(v+8)=6

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Solution for (v-9)(v+8)=6 equation:


Simplifying
(v + -9)(v + 8) = 6

Reorder the terms:
(-9 + v)(v + 8) = 6

Reorder the terms:
(-9 + v)(8 + v) = 6

Multiply (-9 + v) * (8 + v)
(-9(8 + v) + v(8 + v)) = 6
((8 * -9 + v * -9) + v(8 + v)) = 6
((-72 + -9v) + v(8 + v)) = 6
(-72 + -9v + (8 * v + v * v)) = 6
(-72 + -9v + (8v + v2)) = 6

Combine like terms: -9v + 8v = -1v
(-72 + -1v + v2) = 6

Solving
-72 + -1v + v2 = 6

Solving for variable 'v'.

Reorder the terms:
-72 + -6 + -1v + v2 = 6 + -6

Combine like terms: -72 + -6 = -78
-78 + -1v + v2 = 6 + -6

Combine like terms: 6 + -6 = 0
-78 + -1v + v2 = 0

Begin completing the square.

Move the constant term to the right:

Add '78' to each side of the equation.
-78 + -1v + 78 + v2 = 0 + 78

Reorder the terms:
-78 + 78 + -1v + v2 = 0 + 78

Combine like terms: -78 + 78 = 0
0 + -1v + v2 = 0 + 78
-1v + v2 = 0 + 78

Combine like terms: 0 + 78 = 78
-1v + v2 = 78

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 = 78 + 0.25

Reorder the terms:
0.25 + -1v + v2 = 78 + 0.25

Combine like terms: 78 + 0.25 = 78.25
0.25 + -1v + v2 = 78.25

Factor a perfect square on the left side:
(v + -0.5)(v + -0.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(v + -0.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

v + -0.5 = 8.845903006 Simplifying v + -0.5 = 8.845903006 Reorder the terms: -0.5 + v = 8.845903006 Solving -0.5 + v = 8.845903006 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 = 8.845903006 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = 8.845903006 + 0.5 v = 8.845903006 + 0.5 Combine like terms: 8.845903006 + 0.5 = 9.345903006 v = 9.345903006 Simplifying v = 9.345903006

Subproblem 2

v + -0.5 = -8.845903006 Simplifying v + -0.5 = -8.845903006 Reorder the terms: -0.5 + v = -8.845903006 Solving -0.5 + v = -8.845903006 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 = -8.845903006 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + v = -8.845903006 + 0.5 v = -8.845903006 + 0.5 Combine like terms: -8.845903006 + 0.5 = -8.345903006 v = -8.345903006 Simplifying v = -8.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. v = {9.345903006, -8.345903006}

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