16x^2+x-7=0

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Solution for 16x^2+x-7=0 equation:


Simplifying
16x2 + x + -7 = 0

Reorder the terms:
-7 + x + 16x2 = 0

Solving
-7 + x + 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'.
-0.4375 + 0.0625x + x2 = 0

Move the constant term to the right:

Add '0.4375' to each side of the equation.
-0.4375 + 0.0625x + 0.4375 + x2 = 0 + 0.4375

Reorder the terms:
-0.4375 + 0.4375 + 0.0625x + x2 = 0 + 0.4375

Combine like terms: -0.4375 + 0.4375 = 0.0000
0.0000 + 0.0625x + x2 = 0 + 0.4375
0.0625x + x2 = 0 + 0.4375

Combine like terms: 0 + 0.4375 = 0.4375
0.0625x + x2 = 0.4375

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.0625x + 0.25 + x2 = 0.4375 + 0.25

Reorder the terms:
0.25 + 0.0625x + x2 = 0.4375 + 0.25

Combine like terms: 0.4375 + 0.25 = 0.6875
0.25 + 0.0625x + x2 = 0.6875

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.6875

Calculate the square root of the right side: 0.829156198

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.829156198 and -0.829156198.

Subproblem 1

x + 0.5 = 0.829156198 Simplifying x + 0.5 = 0.829156198 Reorder the terms: 0.5 + x = 0.829156198 Solving 0.5 + x = 0.829156198 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.829156198 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.829156198 + -0.5 x = 0.829156198 + -0.5 Combine like terms: 0.829156198 + -0.5 = 0.329156198 x = 0.329156198 Simplifying x = 0.329156198

Subproblem 2

x + 0.5 = -0.829156198 Simplifying x + 0.5 = -0.829156198 Reorder the terms: 0.5 + x = -0.829156198 Solving 0.5 + x = -0.829156198 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.829156198 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.829156198 + -0.5 x = -0.829156198 + -0.5 Combine like terms: -0.829156198 + -0.5 = -1.329156198 x = -1.329156198 Simplifying x = -1.329156198

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.329156198, -1.329156198}

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