x^2-6.5x-12=0

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Solution for x^2-6.5x-12=0 equation:


Simplifying
x2 + -6.5x + -12 = 0

Reorder the terms:
-12 + -6.5x + x2 = 0

Solving
-12 + -6.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -6.5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -6.5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -6.5x + x2 = 0 + 12
-6.5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-6.5x + x2 = 12

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 12 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 12 + 10.5625

Combine like terms: 12 + 10.5625 = 22.5625
10.5625 + -6.5x + x2 = 22.5625

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 22.5625

Calculate the square root of the right side: 4.75

Break this problem into two subproblems by setting 
(x + -3.25) equal to 4.75 and -4.75.

Subproblem 1

x + -3.25 = 4.75 Simplifying x + -3.25 = 4.75 Reorder the terms: -3.25 + x = 4.75 Solving -3.25 + x = 4.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 4.75 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 4.75 + 3.25 x = 4.75 + 3.25 Combine like terms: 4.75 + 3.25 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -3.25 = -4.75 Simplifying x + -3.25 = -4.75 Reorder the terms: -3.25 + x = -4.75 Solving -3.25 + x = -4.75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -4.75 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -4.75 + 3.25 x = -4.75 + 3.25 Combine like terms: -4.75 + 3.25 = -1.5 x = -1.5 Simplifying x = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -1.5}

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