6x^2-15x-25=0

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Solution for 6x^2-15x-25=0 equation:


Simplifying
6x2 + -15x + -25 = 0

Reorder the terms:
-25 + -15x + 6x2 = 0

Solving
-25 + -15x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-4.166666667 + -2.5x + x2 = 0

Move the constant term to the right:

Add '4.166666667' to each side of the equation.
-4.166666667 + -2.5x + 4.166666667 + x2 = 0 + 4.166666667

Reorder the terms:
-4.166666667 + 4.166666667 + -2.5x + x2 = 0 + 4.166666667

Combine like terms: -4.166666667 + 4.166666667 = 0.000000000
0.000000000 + -2.5x + x2 = 0 + 4.166666667
-2.5x + x2 = 0 + 4.166666667

Combine like terms: 0 + 4.166666667 = 4.166666667
-2.5x + x2 = 4.166666667

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 4.166666667 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 4.166666667 + 1.5625

Combine like terms: 4.166666667 + 1.5625 = 5.729166667
1.5625 + -2.5x + x2 = 5.729166667

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 5.729166667

Calculate the square root of the right side: 2.393567769

Break this problem into two subproblems by setting 
(x + -1.25) equal to 2.393567769 and -2.393567769.

Subproblem 1

x + -1.25 = 2.393567769 Simplifying x + -1.25 = 2.393567769 Reorder the terms: -1.25 + x = 2.393567769 Solving -1.25 + x = 2.393567769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 2.393567769 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 2.393567769 + 1.25 x = 2.393567769 + 1.25 Combine like terms: 2.393567769 + 1.25 = 3.643567769 x = 3.643567769 Simplifying x = 3.643567769

Subproblem 2

x + -1.25 = -2.393567769 Simplifying x + -1.25 = -2.393567769 Reorder the terms: -1.25 + x = -2.393567769 Solving -1.25 + x = -2.393567769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -2.393567769 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -2.393567769 + 1.25 x = -2.393567769 + 1.25 Combine like terms: -2.393567769 + 1.25 = -1.143567769 x = -1.143567769 Simplifying x = -1.143567769

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.643567769, -1.143567769}

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