4+5x=x^2-2x

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


Simplifying
4 + 5x = x2 + -2x

Reorder the terms:
4 + 5x = -2x + x2

Solving
4 + 5x = -2x + x2

Solving for variable 'x'.

Combine like terms: 5x + 2x = 7x
4 + 7x + -1x2 = -2x + x2 + 2x + -1x2

Reorder the terms:
4 + 7x + -1x2 = -2x + 2x + x2 + -1x2

Combine like terms: -2x + 2x = 0
4 + 7x + -1x2 = 0 + x2 + -1x2
4 + 7x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
4 + 7x + -1x2 = 0

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

Divide each side by '-1'.
-4 + -7x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -7x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -7x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -7x + x2 = 0 + 4
-7x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-7x + x2 = 4

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 4 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 4 + 12.25

Combine like terms: 4 + 12.25 = 16.25
12.25 + -7x + x2 = 16.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -3.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + -3.5 = 4.031128874 Simplifying x + -3.5 = 4.031128874 Reorder the terms: -3.5 + x = 4.031128874 Solving -3.5 + x = 4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 4.031128874 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 4.031128874 + 3.5 x = 4.031128874 + 3.5 Combine like terms: 4.031128874 + 3.5 = 7.531128874 x = 7.531128874 Simplifying x = 7.531128874

Subproblem 2

x + -3.5 = -4.031128874 Simplifying x + -3.5 = -4.031128874 Reorder the terms: -3.5 + x = -4.031128874 Solving -3.5 + x = -4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -4.031128874 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -4.031128874 + 3.5 x = -4.031128874 + 3.5 Combine like terms: -4.031128874 + 3.5 = -0.531128874 x = -0.531128874 Simplifying x = -0.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.531128874, -0.531128874}

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