x^2-5x=4x-9

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Solution for x^2-5x=4x-9 equation:


Simplifying
x2 + -5x = 4x + -9

Reorder the terms:
-5x + x2 = 4x + -9

Reorder the terms:
-5x + x2 = -9 + 4x

Solving
-5x + x2 = -9 + 4x

Solving for variable 'x'.

Reorder the terms:
9 + -5x + -4x + x2 = -9 + 4x + 9 + -4x

Combine like terms: -5x + -4x = -9x
9 + -9x + x2 = -9 + 4x + 9 + -4x

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

Combine like terms: -9 + 9 = 0
9 + -9x + x2 = 0 + 4x + -4x
9 + -9x + x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
9 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -9x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -9x + x2 = 0 + -9

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

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

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = -9 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -9 + 20.25

Combine like terms: -9 + 20.25 = 11.25
20.25 + -9x + x2 = 11.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(x + -4.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

x + -4.5 = 3.354101966 Simplifying x + -4.5 = 3.354101966 Reorder the terms: -4.5 + x = 3.354101966 Solving -4.5 + x = 3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 3.354101966 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 3.354101966 + 4.5 x = 3.354101966 + 4.5 Combine like terms: 3.354101966 + 4.5 = 7.854101966 x = 7.854101966 Simplifying x = 7.854101966

Subproblem 2

x + -4.5 = -3.354101966 Simplifying x + -4.5 = -3.354101966 Reorder the terms: -4.5 + x = -3.354101966 Solving -4.5 + x = -3.354101966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -3.354101966 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -3.354101966 + 4.5 x = -3.354101966 + 4.5 Combine like terms: -3.354101966 + 4.5 = 1.145898034 x = 1.145898034 Simplifying x = 1.145898034

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.854101966, 1.145898034}

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