9x^2+x-4=11-1

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Solution for 9x^2+x-4=11-1 equation:


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

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

Combine like terms: 11 + -1 = 10
-4 + x + 9x2 = 10

Solving
-4 + x + 9x2 = 10

Solving for variable 'x'.

Reorder the terms:
-4 + -10 + x + 9x2 = 10 + -10

Combine like terms: -4 + -10 = -14
-14 + x + 9x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-14 + x + 9x2 = 0

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

Divide each side by '9'.
-1.555555556 + 0.1111111111x + x2 = 0

Move the constant term to the right:

Add '1.555555556' to each side of the equation.
-1.555555556 + 0.1111111111x + 1.555555556 + x2 = 0 + 1.555555556

Reorder the terms:
-1.555555556 + 1.555555556 + 0.1111111111x + x2 = 0 + 1.555555556

Combine like terms: -1.555555556 + 1.555555556 = 0.000000000
0.000000000 + 0.1111111111x + x2 = 0 + 1.555555556
0.1111111111x + x2 = 0 + 1.555555556

Combine like terms: 0 + 1.555555556 = 1.555555556
0.1111111111x + x2 = 1.555555556

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1111111111x + 0.25 + x2 = 1.555555556 + 0.25

Reorder the terms:
0.25 + 0.1111111111x + x2 = 1.555555556 + 0.25

Combine like terms: 1.555555556 + 0.25 = 1.805555556
0.25 + 0.1111111111x + x2 = 1.805555556

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.805555556

Calculate the square root of the right side: 1.343709625

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.343709625 and -1.343709625.

Subproblem 1

x + 0.5 = 1.343709625 Simplifying x + 0.5 = 1.343709625 Reorder the terms: 0.5 + x = 1.343709625 Solving 0.5 + x = 1.343709625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.343709625 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.343709625 + -0.5 x = 1.343709625 + -0.5 Combine like terms: 1.343709625 + -0.5 = 0.843709625 x = 0.843709625 Simplifying x = 0.843709625

Subproblem 2

x + 0.5 = -1.343709625 Simplifying x + 0.5 = -1.343709625 Reorder the terms: 0.5 + x = -1.343709625 Solving 0.5 + x = -1.343709625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.343709625 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.343709625 + -0.5 x = -1.343709625 + -0.5 Combine like terms: -1.343709625 + -0.5 = -1.843709625 x = -1.843709625 Simplifying x = -1.843709625

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.843709625, -1.843709625}

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