11x^2-3x-9=0

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Solution for 11x^2-3x-9=0 equation:


Simplifying
11x2 + -3x + -9 = 0

Reorder the terms:
-9 + -3x + 11x2 = 0

Solving
-9 + -3x + 11x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
11 the coefficient of the squared term: 

Divide each side by '11'.
-0.8181818182 + -0.2727272727x + x2 = 0

Move the constant term to the right:

Add '0.8181818182' to each side of the equation.
-0.8181818182 + -0.2727272727x + 0.8181818182 + x2 = 0 + 0.8181818182

Reorder the terms:
-0.8181818182 + 0.8181818182 + -0.2727272727x + x2 = 0 + 0.8181818182

Combine like terms: -0.8181818182 + 0.8181818182 = 0.0000000000
0.0000000000 + -0.2727272727x + x2 = 0 + 0.8181818182
-0.2727272727x + x2 = 0 + 0.8181818182

Combine like terms: 0 + 0.8181818182 = 0.8181818182
-0.2727272727x + x2 = 0.8181818182

The x term is -0.2727272727x.  Take half its coefficient (-0.1363636364).
Square it (0.01859504133) and add it to both sides.

Add '0.01859504133' to each side of the equation.
-0.2727272727x + 0.01859504133 + x2 = 0.8181818182 + 0.01859504133

Reorder the terms:
0.01859504133 + -0.2727272727x + x2 = 0.8181818182 + 0.01859504133

Combine like terms: 0.8181818182 + 0.01859504133 = 0.83677685953
0.01859504133 + -0.2727272727x + x2 = 0.83677685953

Factor a perfect square on the left side:
(x + -0.1363636364)(x + -0.1363636364) = 0.83677685953

Calculate the square root of the right side: 0.914755082

Break this problem into two subproblems by setting 
(x + -0.1363636364) equal to 0.914755082 and -0.914755082.

Subproblem 1

x + -0.1363636364 = 0.914755082 Simplifying x + -0.1363636364 = 0.914755082 Reorder the terms: -0.1363636364 + x = 0.914755082 Solving -0.1363636364 + x = 0.914755082 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1363636364' to each side of the equation. -0.1363636364 + 0.1363636364 + x = 0.914755082 + 0.1363636364 Combine like terms: -0.1363636364 + 0.1363636364 = 0.0000000000 0.0000000000 + x = 0.914755082 + 0.1363636364 x = 0.914755082 + 0.1363636364 Combine like terms: 0.914755082 + 0.1363636364 = 1.0511187184 x = 1.0511187184 Simplifying x = 1.0511187184

Subproblem 2

x + -0.1363636364 = -0.914755082 Simplifying x + -0.1363636364 = -0.914755082 Reorder the terms: -0.1363636364 + x = -0.914755082 Solving -0.1363636364 + x = -0.914755082 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1363636364' to each side of the equation. -0.1363636364 + 0.1363636364 + x = -0.914755082 + 0.1363636364 Combine like terms: -0.1363636364 + 0.1363636364 = 0.0000000000 0.0000000000 + x = -0.914755082 + 0.1363636364 x = -0.914755082 + 0.1363636364 Combine like terms: -0.914755082 + 0.1363636364 = -0.7783914456 x = -0.7783914456 Simplifying x = -0.7783914456

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0511187184, -0.7783914456}

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