11x^2-2=7x

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Solution for 11x^2-2=7x equation:


Simplifying
11x2 + -2 = 7x

Reorder the terms:
-2 + 11x2 = 7x

Solving
-2 + 11x2 = 7x

Solving for variable 'x'.

Reorder the terms:
-2 + -7x + 11x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-2 + -7x + 11x2 = 0

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

Divide each side by '11'.
-0.1818181818 + -0.6363636364x + x2 = 0

Move the constant term to the right:

Add '0.1818181818' to each side of the equation.
-0.1818181818 + -0.6363636364x + 0.1818181818 + x2 = 0 + 0.1818181818

Reorder the terms:
-0.1818181818 + 0.1818181818 + -0.6363636364x + x2 = 0 + 0.1818181818

Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000
0.0000000000 + -0.6363636364x + x2 = 0 + 0.1818181818
-0.6363636364x + x2 = 0 + 0.1818181818

Combine like terms: 0 + 0.1818181818 = 0.1818181818
-0.6363636364x + x2 = 0.1818181818

The x term is -0.6363636364x.  Take half its coefficient (-0.3181818182).
Square it (0.1012396694) and add it to both sides.

Add '0.1012396694' to each side of the equation.
-0.6363636364x + 0.1012396694 + x2 = 0.1818181818 + 0.1012396694

Reorder the terms:
0.1012396694 + -0.6363636364x + x2 = 0.1818181818 + 0.1012396694

Combine like terms: 0.1818181818 + 0.1012396694 = 0.2830578512
0.1012396694 + -0.6363636364x + x2 = 0.2830578512

Factor a perfect square on the left side:
(x + -0.3181818182)(x + -0.3181818182) = 0.2830578512

Calculate the square root of the right side: 0.532031814

Break this problem into two subproblems by setting 
(x + -0.3181818182) equal to 0.532031814 and -0.532031814.

Subproblem 1

x + -0.3181818182 = 0.532031814 Simplifying x + -0.3181818182 = 0.532031814 Reorder the terms: -0.3181818182 + x = 0.532031814 Solving -0.3181818182 + x = 0.532031814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3181818182' to each side of the equation. -0.3181818182 + 0.3181818182 + x = 0.532031814 + 0.3181818182 Combine like terms: -0.3181818182 + 0.3181818182 = 0.0000000000 0.0000000000 + x = 0.532031814 + 0.3181818182 x = 0.532031814 + 0.3181818182 Combine like terms: 0.532031814 + 0.3181818182 = 0.8502136322 x = 0.8502136322 Simplifying x = 0.8502136322

Subproblem 2

x + -0.3181818182 = -0.532031814 Simplifying x + -0.3181818182 = -0.532031814 Reorder the terms: -0.3181818182 + x = -0.532031814 Solving -0.3181818182 + x = -0.532031814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3181818182' to each side of the equation. -0.3181818182 + 0.3181818182 + x = -0.532031814 + 0.3181818182 Combine like terms: -0.3181818182 + 0.3181818182 = 0.0000000000 0.0000000000 + x = -0.532031814 + 0.3181818182 x = -0.532031814 + 0.3181818182 Combine like terms: -0.532031814 + 0.3181818182 = -0.2138499958 x = -0.2138499958 Simplifying x = -0.2138499958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8502136322, -0.2138499958}

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