8v^2-15v-18=0

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Solution for 8v^2-15v-18=0 equation:


Simplifying
8v2 + -15v + -18 = 0

Reorder the terms:
-18 + -15v + 8v2 = 0

Solving
-18 + -15v + 8v2 = 0

Solving for variable 'v'.

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

Divide each side by '8'.
-2.25 + -1.875v + v2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -1.875v + 2.25 + v2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -1.875v + v2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -1.875v + v2 = 0 + 2.25
-1.875v + v2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-1.875v + v2 = 2.25

The v term is -1.875v.  Take half its coefficient (-0.9375).
Square it (0.87890625) and add it to both sides.

Add '0.87890625' to each side of the equation.
-1.875v + 0.87890625 + v2 = 2.25 + 0.87890625

Reorder the terms:
0.87890625 + -1.875v + v2 = 2.25 + 0.87890625

Combine like terms: 2.25 + 0.87890625 = 3.12890625
0.87890625 + -1.875v + v2 = 3.12890625

Factor a perfect square on the left side:
(v + -0.9375)(v + -0.9375) = 3.12890625

Calculate the square root of the right side: 1.768871462

Break this problem into two subproblems by setting 
(v + -0.9375) equal to 1.768871462 and -1.768871462.

Subproblem 1

v + -0.9375 = 1.768871462 Simplifying v + -0.9375 = 1.768871462 Reorder the terms: -0.9375 + v = 1.768871462 Solving -0.9375 + v = 1.768871462 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + v = 1.768871462 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + v = 1.768871462 + 0.9375 v = 1.768871462 + 0.9375 Combine like terms: 1.768871462 + 0.9375 = 2.706371462 v = 2.706371462 Simplifying v = 2.706371462

Subproblem 2

v + -0.9375 = -1.768871462 Simplifying v + -0.9375 = -1.768871462 Reorder the terms: -0.9375 + v = -1.768871462 Solving -0.9375 + v = -1.768871462 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + v = -1.768871462 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + v = -1.768871462 + 0.9375 v = -1.768871462 + 0.9375 Combine like terms: -1.768871462 + 0.9375 = -0.831371462 v = -0.831371462 Simplifying v = -0.831371462

Solution

The solution to the problem is based on the solutions from the subproblems. v = {2.706371462, -0.831371462}

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