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

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


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

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

Solving
9x = 4 + -1x + x2

Solving for variable 'x'.

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

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

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

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

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

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

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

Divide each side by '-1'.
4 + -10x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -10x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -10x + x2 = 0 + -4

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

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

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -4 + 25

Reorder the terms:
25 + -10x + x2 = -4 + 25

Combine like terms: -4 + 25 = 21
25 + -10x + x2 = 21

Factor a perfect square on the left side:
(x + -5)(x + -5) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + -5) equal to 4.582575695 and -4.582575695.

Subproblem 1

x + -5 = 4.582575695 Simplifying x + -5 = 4.582575695 Reorder the terms: -5 + x = 4.582575695 Solving -5 + x = 4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 4.582575695 + 5 Combine like terms: -5 + 5 = 0 0 + x = 4.582575695 + 5 x = 4.582575695 + 5 Combine like terms: 4.582575695 + 5 = 9.582575695 x = 9.582575695 Simplifying x = 9.582575695

Subproblem 2

x + -5 = -4.582575695 Simplifying x + -5 = -4.582575695 Reorder the terms: -5 + x = -4.582575695 Solving -5 + x = -4.582575695 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -4.582575695 + 5 Combine like terms: -5 + 5 = 0 0 + x = -4.582575695 + 5 x = -4.582575695 + 5 Combine like terms: -4.582575695 + 5 = 0.417424305 x = 0.417424305 Simplifying x = 0.417424305

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.582575695, 0.417424305}

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