9x^2+x-4=11-x

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Solution for 9x^2+x-4=11-x equation:


Simplifying
9x2 + x + -4 = 11 + -1x

Reorder the terms:
-4 + x + 9x2 = 11 + -1x

Solving
-4 + x + 9x2 = 11 + -1x

Solving for variable 'x'.

Reorder the terms:
-4 + -11 + x + x + 9x2 = 11 + -1x + -11 + x

Combine like terms: -4 + -11 = -15
-15 + x + x + 9x2 = 11 + -1x + -11 + x

Combine like terms: x + x = 2x
-15 + 2x + 9x2 = 11 + -1x + -11 + x

Reorder the terms:
-15 + 2x + 9x2 = 11 + -11 + -1x + x

Combine like terms: 11 + -11 = 0
-15 + 2x + 9x2 = 0 + -1x + x
-15 + 2x + 9x2 = -1x + x

Combine like terms: -1x + x = 0
-15 + 2x + 9x2 = 0

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

Divide each side by '9'.
-1.666666667 + 0.2222222222x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + 0.2222222222x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + 0.2222222222x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + 0.2222222222x + x2 = 0 + 1.666666667
0.2222222222x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
0.2222222222x + x2 = 1.666666667

The x term is 0.2222222222x.  Take half its coefficient (0.1111111111).
Square it (0.01234567901) and add it to both sides.

Add '0.01234567901' to each side of the equation.
0.2222222222x + 0.01234567901 + x2 = 1.666666667 + 0.01234567901

Reorder the terms:
0.01234567901 + 0.2222222222x + x2 = 1.666666667 + 0.01234567901

Combine like terms: 1.666666667 + 0.01234567901 = 1.67901234601
0.01234567901 + 0.2222222222x + x2 = 1.67901234601

Factor a perfect square on the left side:
(x + 0.1111111111)(x + 0.1111111111) = 1.67901234601

Calculate the square root of the right side: 1.295767088

Break this problem into two subproblems by setting 
(x + 0.1111111111) equal to 1.295767088 and -1.295767088.

Subproblem 1

x + 0.1111111111 = 1.295767088 Simplifying x + 0.1111111111 = 1.295767088 Reorder the terms: 0.1111111111 + x = 1.295767088 Solving 0.1111111111 + x = 1.295767088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1111111111' to each side of the equation. 0.1111111111 + -0.1111111111 + x = 1.295767088 + -0.1111111111 Combine like terms: 0.1111111111 + -0.1111111111 = 0.0000000000 0.0000000000 + x = 1.295767088 + -0.1111111111 x = 1.295767088 + -0.1111111111 Combine like terms: 1.295767088 + -0.1111111111 = 1.1846559769 x = 1.1846559769 Simplifying x = 1.1846559769

Subproblem 2

x + 0.1111111111 = -1.295767088 Simplifying x + 0.1111111111 = -1.295767088 Reorder the terms: 0.1111111111 + x = -1.295767088 Solving 0.1111111111 + x = -1.295767088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1111111111' to each side of the equation. 0.1111111111 + -0.1111111111 + x = -1.295767088 + -0.1111111111 Combine like terms: 0.1111111111 + -0.1111111111 = 0.0000000000 0.0000000000 + x = -1.295767088 + -0.1111111111 x = -1.295767088 + -0.1111111111 Combine like terms: -1.295767088 + -0.1111111111 = -1.4068781991 x = -1.4068781991 Simplifying x = -1.4068781991

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1846559769, -1.4068781991}

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