(-16x^2)+(21x)-6=0

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Solution for (-16x^2)+(21x)-6=0 equation:


Simplifying
(-16x2) + (21x) + -6 = 0

Reorder the terms:
-6 + (21x) + (-16x2) = 0

Solving
-6 + (21x) + (-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'.
0.375 + (-1.3125x) + x2 = 0

Move the constant term to the right:

Add '-0.375' to each side of the equation.
0.375 + (-1.3125x) + -0.375 + x2 = 0 + -0.375

Reorder the terms:
0.375 + -0.375 + (-1.3125x) + x2 = 0 + -0.375

Combine like terms: 0.375 + -0.375 = 0.000
0.000 + (-1.3125x) + x2 = 0 + -0.375
(-1.3125x) + x2 = 0 + -0.375

Combine like terms: 0 + -0.375 = -0.375
(-1.3125x) + x2 = -0.375

The x term is (-1.3125x).  Take half its coefficient (-0.65625).
Square it (0.4306640625) and add it to both sides.

Add '0.4306640625' to each side of the equation.
(-1.3125x) + 0.4306640625 + x2 = -0.375 + 0.4306640625

Reorder the terms:
0.4306640625 + (-1.3125x) + x2 = -0.375 + 0.4306640625

Combine like terms: -0.375 + 0.4306640625 = 0.0556640625
0.4306640625 + (-1.3125x) + x2 = 0.0556640625

Factor a perfect square on the left side:
((x) + -0.65625)((x) + -0.65625) = 0.0556640625

Calculate the square root of the right side: 0.235932326

Break this problem into two subproblems by setting 
((x) + -0.65625) equal to 0.235932326 and -0.235932326.

Subproblem 1

(x) + -0.65625 = 0.235932326 Simplifying (x) + -0.65625 = 0.235932326 x + -0.65625 = 0.235932326 Reorder the terms: -0.65625 + x = 0.235932326 Solving -0.65625 + x = 0.235932326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.65625' to each side of the equation. -0.65625 + 0.65625 + x = 0.235932326 + 0.65625 Combine like terms: -0.65625 + 0.65625 = 0.00000 0.00000 + x = 0.235932326 + 0.65625 x = 0.235932326 + 0.65625 Combine like terms: 0.235932326 + 0.65625 = 0.892182326 x = 0.892182326 Simplifying x = 0.892182326

Subproblem 2

(x) + -0.65625 = -0.235932326 Simplifying (x) + -0.65625 = -0.235932326 x + -0.65625 = -0.235932326 Reorder the terms: -0.65625 + x = -0.235932326 Solving -0.65625 + x = -0.235932326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.65625' to each side of the equation. -0.65625 + 0.65625 + x = -0.235932326 + 0.65625 Combine like terms: -0.65625 + 0.65625 = 0.00000 0.00000 + x = -0.235932326 + 0.65625 x = -0.235932326 + 0.65625 Combine like terms: -0.235932326 + 0.65625 = 0.420317674 x = 0.420317674 Simplifying x = 0.420317674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.892182326, 0.420317674}

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