16x^2+28x+9=0

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Solution for 16x^2+28x+9=0 equation:


Simplifying
16x2 + 28x + 9 = 0

Reorder the terms:
9 + 28x + 16x2 = 0

Solving
9 + 28x + 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 + 1.75x + x2 = 0

Move the constant term to the right:

Add '-0.5625' to each side of the equation.
0.5625 + 1.75x + -0.5625 + x2 = 0 + -0.5625

Reorder the terms:
0.5625 + -0.5625 + 1.75x + x2 = 0 + -0.5625

Combine like terms: 0.5625 + -0.5625 = 0.0000
0.0000 + 1.75x + x2 = 0 + -0.5625
1.75x + x2 = 0 + -0.5625

Combine like terms: 0 + -0.5625 = -0.5625
1.75x + x2 = -0.5625

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = -0.5625 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = -0.5625 + 0.765625

Combine like terms: -0.5625 + 0.765625 = 0.203125
0.765625 + 1.75x + x2 = 0.203125

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 0.203125

Calculate the square root of the right side: 0.450693909

Break this problem into two subproblems by setting 
(x + 0.875) equal to 0.450693909 and -0.450693909.

Subproblem 1

x + 0.875 = 0.450693909 Simplifying x + 0.875 = 0.450693909 Reorder the terms: 0.875 + x = 0.450693909 Solving 0.875 + x = 0.450693909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 0.450693909 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 0.450693909 + -0.875 x = 0.450693909 + -0.875 Combine like terms: 0.450693909 + -0.875 = -0.424306091 x = -0.424306091 Simplifying x = -0.424306091

Subproblem 2

x + 0.875 = -0.450693909 Simplifying x + 0.875 = -0.450693909 Reorder the terms: 0.875 + x = -0.450693909 Solving 0.875 + x = -0.450693909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -0.450693909 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -0.450693909 + -0.875 x = -0.450693909 + -0.875 Combine like terms: -0.450693909 + -0.875 = -1.325693909 x = -1.325693909 Simplifying x = -1.325693909

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.424306091, -1.325693909}

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