9(x)=x^2-x+4-9x

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


Simplifying
9(x) = x2 + -1x + 4 + -9x

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

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

Solving
9x = 4 + -10x + x2

Solving for variable 'x'.

Reorder the terms:
-4 + 9x + 10x + -1x2 = 4 + -10x + x2 + -4 + 10x + -1x2

Combine like terms: 9x + 10x = 19x
-4 + 19x + -1x2 = 4 + -10x + x2 + -4 + 10x + -1x2

Reorder the terms:
-4 + 19x + -1x2 = 4 + -4 + -10x + 10x + x2 + -1x2

Combine like terms: 4 + -4 = 0
-4 + 19x + -1x2 = 0 + -10x + 10x + x2 + -1x2
-4 + 19x + -1x2 = -10x + 10x + x2 + -1x2

Combine like terms: -10x + 10x = 0
-4 + 19x + -1x2 = 0 + x2 + -1x2
-4 + 19x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-4 + 19x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
4 + -19x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -19x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -19x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -19x + x2 = 0 + -4
-19x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-19x + x2 = -4

The x term is -19x.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19x + 90.25 + x2 = -4 + 90.25

Reorder the terms:
90.25 + -19x + x2 = -4 + 90.25

Combine like terms: -4 + 90.25 = 86.25
90.25 + -19x + x2 = 86.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 86.25

Calculate the square root of the right side: 9.287087811

Break this problem into two subproblems by setting 
(x + -9.5) equal to 9.287087811 and -9.287087811.

Subproblem 1

x + -9.5 = 9.287087811 Simplifying x + -9.5 = 9.287087811 Reorder the terms: -9.5 + x = 9.287087811 Solving -9.5 + x = 9.287087811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = 9.287087811 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 9.287087811 + 9.5 x = 9.287087811 + 9.5 Combine like terms: 9.287087811 + 9.5 = 18.787087811 x = 18.787087811 Simplifying x = 18.787087811

Subproblem 2

x + -9.5 = -9.287087811 Simplifying x + -9.5 = -9.287087811 Reorder the terms: -9.5 + x = -9.287087811 Solving -9.5 + x = -9.287087811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = -9.287087811 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -9.287087811 + 9.5 x = -9.287087811 + 9.5 Combine like terms: -9.287087811 + 9.5 = 0.212912189 x = 0.212912189 Simplifying x = 0.212912189

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.787087811, 0.212912189}

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