15x^2-47x-26=0

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Solution for 15x^2-47x-26=0 equation:


Simplifying
15x2 + -47x + -26 = 0

Reorder the terms:
-26 + -47x + 15x2 = 0

Solving
-26 + -47x + 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 + -3.133333333x + x2 = 0

Move the constant term to the right:

Add '1.733333333' to each side of the equation.
-1.733333333 + -3.133333333x + 1.733333333 + x2 = 0 + 1.733333333

Reorder the terms:
-1.733333333 + 1.733333333 + -3.133333333x + x2 = 0 + 1.733333333

Combine like terms: -1.733333333 + 1.733333333 = 0.000000000
0.000000000 + -3.133333333x + x2 = 0 + 1.733333333
-3.133333333x + x2 = 0 + 1.733333333

Combine like terms: 0 + 1.733333333 = 1.733333333
-3.133333333x + x2 = 1.733333333

The x term is -3.133333333x.  Take half its coefficient (-1.566666667).
Square it (2.454444445) and add it to both sides.

Add '2.454444445' to each side of the equation.
-3.133333333x + 2.454444445 + x2 = 1.733333333 + 2.454444445

Reorder the terms:
2.454444445 + -3.133333333x + x2 = 1.733333333 + 2.454444445

Combine like terms: 1.733333333 + 2.454444445 = 4.187777778
2.454444445 + -3.133333333x + x2 = 4.187777778

Factor a perfect square on the left side:
(x + -1.566666667)(x + -1.566666667) = 4.187777778

Calculate the square root of the right side: 2.046406064

Break this problem into two subproblems by setting 
(x + -1.566666667) equal to 2.046406064 and -2.046406064.

Subproblem 1

x + -1.566666667 = 2.046406064 Simplifying x + -1.566666667 = 2.046406064 Reorder the terms: -1.566666667 + x = 2.046406064 Solving -1.566666667 + x = 2.046406064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.566666667' to each side of the equation. -1.566666667 + 1.566666667 + x = 2.046406064 + 1.566666667 Combine like terms: -1.566666667 + 1.566666667 = 0.000000000 0.000000000 + x = 2.046406064 + 1.566666667 x = 2.046406064 + 1.566666667 Combine like terms: 2.046406064 + 1.566666667 = 3.613072731 x = 3.613072731 Simplifying x = 3.613072731

Subproblem 2

x + -1.566666667 = -2.046406064 Simplifying x + -1.566666667 = -2.046406064 Reorder the terms: -1.566666667 + x = -2.046406064 Solving -1.566666667 + x = -2.046406064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.566666667' to each side of the equation. -1.566666667 + 1.566666667 + x = -2.046406064 + 1.566666667 Combine like terms: -1.566666667 + 1.566666667 = 0.000000000 0.000000000 + x = -2.046406064 + 1.566666667 x = -2.046406064 + 1.566666667 Combine like terms: -2.046406064 + 1.566666667 = -0.479739397 x = -0.479739397 Simplifying x = -0.479739397

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.613072731, -0.479739397}

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