4x^2-26x-15=0

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Solution for 4x^2-26x-15=0 equation:


Simplifying
4x2 + -26x + -15 = 0

Reorder the terms:
-15 + -26x + 4x2 = 0

Solving
-15 + -26x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-3.75 + -6.5x + x2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -6.5x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -6.5x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -6.5x + x2 = 0 + 3.75
-6.5x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-6.5x + x2 = 3.75

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 = 3.75 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 3.75 + 10.5625

Combine like terms: 3.75 + 10.5625 = 14.3125
10.5625 + -6.5x + x2 = 14.3125

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 14.3125

Calculate the square root of the right side: 3.783186488

Break this problem into two subproblems by setting 
(x + -3.25) equal to 3.783186488 and -3.783186488.

Subproblem 1

x + -3.25 = 3.783186488 Simplifying x + -3.25 = 3.783186488 Reorder the terms: -3.25 + x = 3.783186488 Solving -3.25 + x = 3.783186488 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 = 3.783186488 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 3.783186488 + 3.25 x = 3.783186488 + 3.25 Combine like terms: 3.783186488 + 3.25 = 7.033186488 x = 7.033186488 Simplifying x = 7.033186488

Subproblem 2

x + -3.25 = -3.783186488 Simplifying x + -3.25 = -3.783186488 Reorder the terms: -3.25 + x = -3.783186488 Solving -3.25 + x = -3.783186488 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 = -3.783186488 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -3.783186488 + 3.25 x = -3.783186488 + 3.25 Combine like terms: -3.783186488 + 3.25 = -0.533186488 x = -0.533186488 Simplifying x = -0.533186488

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.033186488, -0.533186488}

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