16x^2+64x-9=0

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Solution for 16x^2+64x-9=0 equation:


Simplifying
16x2 + 64x + -9 = 0

Reorder the terms:
-9 + 64x + 16x2 = 0

Solving
-9 + 64x + 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 + 4x + x2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + 4x + 0.5625 + x2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + 4x + x2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + 4x + x2 = 0 + 0.5625
4x + x2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
4x + x2 = 0.5625

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 0.5625 + 4

Reorder the terms:
4 + 4x + x2 = 0.5625 + 4

Combine like terms: 0.5625 + 4 = 4.5625
4 + 4x + x2 = 4.5625

Factor a perfect square on the left side:
(x + 2)(x + 2) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(x + 2) equal to 2.136000936 and -2.136000936.

Subproblem 1

x + 2 = 2.136000936 Simplifying x + 2 = 2.136000936 Reorder the terms: 2 + x = 2.136000936 Solving 2 + x = 2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.136000936 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.136000936 + -2 x = 2.136000936 + -2 Combine like terms: 2.136000936 + -2 = 0.136000936 x = 0.136000936 Simplifying x = 0.136000936

Subproblem 2

x + 2 = -2.136000936 Simplifying x + 2 = -2.136000936 Reorder the terms: 2 + x = -2.136000936 Solving 2 + x = -2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.136000936 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.136000936 + -2 x = -2.136000936 + -2 Combine like terms: -2.136000936 + -2 = -4.136000936 x = -4.136000936 Simplifying x = -4.136000936

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.136000936, -4.136000936}

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