56X^2-15X-15=0

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Solution for 56X^2-15X-15=0 equation:


Simplifying
56X2 + -15X + -15 = 0

Reorder the terms:
-15 + -15X + 56X2 = 0

Solving
-15 + -15X + 56X2 = 0

Solving for variable 'X'.

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

Divide each side by '56'.
-0.2678571429 + -0.2678571429X + X2 = 0

Move the constant term to the right:

Add '0.2678571429' to each side of the equation.
-0.2678571429 + -0.2678571429X + 0.2678571429 + X2 = 0 + 0.2678571429

Reorder the terms:
-0.2678571429 + 0.2678571429 + -0.2678571429X + X2 = 0 + 0.2678571429

Combine like terms: -0.2678571429 + 0.2678571429 = 0.0000000000
0.0000000000 + -0.2678571429X + X2 = 0 + 0.2678571429
-0.2678571429X + X2 = 0 + 0.2678571429

Combine like terms: 0 + 0.2678571429 = 0.2678571429
-0.2678571429X + X2 = 0.2678571429

The X term is -0.2678571429X.  Take half its coefficient (-0.1339285715).
Square it (0.01793686226) and add it to both sides.

Add '0.01793686226' to each side of the equation.
-0.2678571429X + 0.01793686226 + X2 = 0.2678571429 + 0.01793686226

Reorder the terms:
0.01793686226 + -0.2678571429X + X2 = 0.2678571429 + 0.01793686226

Combine like terms: 0.2678571429 + 0.01793686226 = 0.28579400516
0.01793686226 + -0.2678571429X + X2 = 0.28579400516

Factor a perfect square on the left side:
(X + -0.1339285715)(X + -0.1339285715) = 0.28579400516

Calculate the square root of the right side: 0.534597049

Break this problem into two subproblems by setting 
(X + -0.1339285715) equal to 0.534597049 and -0.534597049.

Subproblem 1

X + -0.1339285715 = 0.534597049 Simplifying X + -0.1339285715 = 0.534597049 Reorder the terms: -0.1339285715 + X = 0.534597049 Solving -0.1339285715 + X = 0.534597049 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.1339285715' to each side of the equation. -0.1339285715 + 0.1339285715 + X = 0.534597049 + 0.1339285715 Combine like terms: -0.1339285715 + 0.1339285715 = 0.0000000000 0.0000000000 + X = 0.534597049 + 0.1339285715 X = 0.534597049 + 0.1339285715 Combine like terms: 0.534597049 + 0.1339285715 = 0.6685256205 X = 0.6685256205 Simplifying X = 0.6685256205

Subproblem 2

X + -0.1339285715 = -0.534597049 Simplifying X + -0.1339285715 = -0.534597049 Reorder the terms: -0.1339285715 + X = -0.534597049 Solving -0.1339285715 + X = -0.534597049 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.1339285715' to each side of the equation. -0.1339285715 + 0.1339285715 + X = -0.534597049 + 0.1339285715 Combine like terms: -0.1339285715 + 0.1339285715 = 0.0000000000 0.0000000000 + X = -0.534597049 + 0.1339285715 X = -0.534597049 + 0.1339285715 Combine like terms: -0.534597049 + 0.1339285715 = -0.4006684775 X = -0.4006684775 Simplifying X = -0.4006684775

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.6685256205, -0.4006684775}

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