15x^2-16x-26=0

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Solution for 15x^2-16x-26=0 equation:


Simplifying
15x2 + -16x + -26 = 0

Reorder the terms:
-26 + -16x + 15x2 = 0

Solving
-26 + -16x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-1.733333333 + -1.066666667x + x2 = 0

Move the constant term to the right:

Add '1.733333333' to each side of the equation.
-1.733333333 + -1.066666667x + 1.733333333 + x2 = 0 + 1.733333333

Reorder the terms:
-1.733333333 + 1.733333333 + -1.066666667x + x2 = 0 + 1.733333333

Combine like terms: -1.733333333 + 1.733333333 = 0.000000000
0.000000000 + -1.066666667x + x2 = 0 + 1.733333333
-1.066666667x + x2 = 0 + 1.733333333

Combine like terms: 0 + 1.733333333 = 1.733333333
-1.066666667x + x2 = 1.733333333

The x term is -1.066666667x.  Take half its coefficient (-0.5333333335).
Square it (0.2844444446) and add it to both sides.

Add '0.2844444446' to each side of the equation.
-1.066666667x + 0.2844444446 + x2 = 1.733333333 + 0.2844444446

Reorder the terms:
0.2844444446 + -1.066666667x + x2 = 1.733333333 + 0.2844444446

Combine like terms: 1.733333333 + 0.2844444446 = 2.0177777776
0.2844444446 + -1.066666667x + x2 = 2.0177777776

Factor a perfect square on the left side:
(x + -0.5333333335)(x + -0.5333333335) = 2.0177777776

Calculate the square root of the right side: 1.42048505

Break this problem into two subproblems by setting 
(x + -0.5333333335) equal to 1.42048505 and -1.42048505.

Subproblem 1

x + -0.5333333335 = 1.42048505 Simplifying x + -0.5333333335 = 1.42048505 Reorder the terms: -0.5333333335 + x = 1.42048505 Solving -0.5333333335 + x = 1.42048505 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5333333335' to each side of the equation. -0.5333333335 + 0.5333333335 + x = 1.42048505 + 0.5333333335 Combine like terms: -0.5333333335 + 0.5333333335 = 0.0000000000 0.0000000000 + x = 1.42048505 + 0.5333333335 x = 1.42048505 + 0.5333333335 Combine like terms: 1.42048505 + 0.5333333335 = 1.9538183835 x = 1.9538183835 Simplifying x = 1.9538183835

Subproblem 2

x + -0.5333333335 = -1.42048505 Simplifying x + -0.5333333335 = -1.42048505 Reorder the terms: -0.5333333335 + x = -1.42048505 Solving -0.5333333335 + x = -1.42048505 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5333333335' to each side of the equation. -0.5333333335 + 0.5333333335 + x = -1.42048505 + 0.5333333335 Combine like terms: -0.5333333335 + 0.5333333335 = 0.0000000000 0.0000000000 + x = -1.42048505 + 0.5333333335 x = -1.42048505 + 0.5333333335 Combine like terms: -1.42048505 + 0.5333333335 = -0.8871517165 x = -0.8871517165 Simplifying x = -0.8871517165

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.9538183835, -0.8871517165}

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