16x^2-x-91=0

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Solution for 16x^2-x-91=0 equation:


Simplifying
16x2 + -1x + -91 = 0

Reorder the terms:
-91 + -1x + 16x2 = 0

Solving
-91 + -1x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-5.6875 + -0.0625x + x2 = 0

Move the constant term to the right:

Add '5.6875' to each side of the equation.
-5.6875 + -0.0625x + 5.6875 + x2 = 0 + 5.6875

Reorder the terms:
-5.6875 + 5.6875 + -0.0625x + x2 = 0 + 5.6875

Combine like terms: -5.6875 + 5.6875 = 0.0000
0.0000 + -0.0625x + x2 = 0 + 5.6875
-0.0625x + x2 = 0 + 5.6875

Combine like terms: 0 + 5.6875 = 5.6875
-0.0625x + x2 = 5.6875

The x term is -0.0625x.  Take half its coefficient (-0.03125).
Square it (0.0009765625) and add it to both sides.

Add '0.0009765625' to each side of the equation.
-0.0625x + 0.0009765625 + x2 = 5.6875 + 0.0009765625

Reorder the terms:
0.0009765625 + -0.0625x + x2 = 5.6875 + 0.0009765625

Combine like terms: 5.6875 + 0.0009765625 = 5.6884765625
0.0009765625 + -0.0625x + x2 = 5.6884765625

Factor a perfect square on the left side:
(x + -0.03125)(x + -0.03125) = 5.6884765625

Calculate the square root of the right side: 2.385052738

Break this problem into two subproblems by setting 
(x + -0.03125) equal to 2.385052738 and -2.385052738.

Subproblem 1

x + -0.03125 = 2.385052738 Simplifying x + -0.03125 = 2.385052738 Reorder the terms: -0.03125 + x = 2.385052738 Solving -0.03125 + x = 2.385052738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.03125' to each side of the equation. -0.03125 + 0.03125 + x = 2.385052738 + 0.03125 Combine like terms: -0.03125 + 0.03125 = 0.00000 0.00000 + x = 2.385052738 + 0.03125 x = 2.385052738 + 0.03125 Combine like terms: 2.385052738 + 0.03125 = 2.416302738 x = 2.416302738 Simplifying x = 2.416302738

Subproblem 2

x + -0.03125 = -2.385052738 Simplifying x + -0.03125 = -2.385052738 Reorder the terms: -0.03125 + x = -2.385052738 Solving -0.03125 + x = -2.385052738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.03125' to each side of the equation. -0.03125 + 0.03125 + x = -2.385052738 + 0.03125 Combine like terms: -0.03125 + 0.03125 = 0.00000 0.00000 + x = -2.385052738 + 0.03125 x = -2.385052738 + 0.03125 Combine like terms: -2.385052738 + 0.03125 = -2.353802738 x = -2.353802738 Simplifying x = -2.353802738

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.416302738, -2.353802738}

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