16x^2+6x-9=0

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Solution for 16x^2+6x-9=0 equation:


Simplifying
16x2 + 6x + -9 = 0

Reorder the terms:
-9 + 6x + 16x2 = 0

Solving
-9 + 6x + 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'.
-0.5625 + 0.375x + x2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + 0.375x + 0.5625 + x2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + 0.375x + x2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + 0.375x + x2 = 0 + 0.5625
0.375x + x2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
0.375x + x2 = 0.5625

The x term is 0.375x.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375x + 0.03515625 + x2 = 0.5625 + 0.03515625

Reorder the terms:
0.03515625 + 0.375x + x2 = 0.5625 + 0.03515625

Combine like terms: 0.5625 + 0.03515625 = 0.59765625
0.03515625 + 0.375x + x2 = 0.59765625

Factor a perfect square on the left side:
(x + 0.1875)(x + 0.1875) = 0.59765625

Calculate the square root of the right side: 0.773082305

Break this problem into two subproblems by setting 
(x + 0.1875) equal to 0.773082305 and -0.773082305.

Subproblem 1

x + 0.1875 = 0.773082305 Simplifying x + 0.1875 = 0.773082305 Reorder the terms: 0.1875 + x = 0.773082305 Solving 0.1875 + x = 0.773082305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + x = 0.773082305 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + x = 0.773082305 + -0.1875 x = 0.773082305 + -0.1875 Combine like terms: 0.773082305 + -0.1875 = 0.585582305 x = 0.585582305 Simplifying x = 0.585582305

Subproblem 2

x + 0.1875 = -0.773082305 Simplifying x + 0.1875 = -0.773082305 Reorder the terms: 0.1875 + x = -0.773082305 Solving 0.1875 + x = -0.773082305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + x = -0.773082305 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + x = -0.773082305 + -0.1875 x = -0.773082305 + -0.1875 Combine like terms: -0.773082305 + -0.1875 = -0.960582305 x = -0.960582305 Simplifying x = -0.960582305

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.585582305, -0.960582305}

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