5x^2=18x-4

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Solution for 5x^2=18x-4 equation:


Simplifying
5x2 = 18x + -4

Reorder the terms:
5x2 = -4 + 18x

Solving
5x2 = -4 + 18x

Solving for variable 'x'.

Reorder the terms:
4 + -18x + 5x2 = -4 + 18x + 4 + -18x

Reorder the terms:
4 + -18x + 5x2 = -4 + 4 + 18x + -18x

Combine like terms: -4 + 4 = 0
4 + -18x + 5x2 = 0 + 18x + -18x
4 + -18x + 5x2 = 18x + -18x

Combine like terms: 18x + -18x = 0
4 + -18x + 5x2 = 0

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

Divide each side by '5'.
0.8 + -3.6x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + -3.6x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + -3.6x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -3.6x + x2 = 0 + -0.8
-3.6x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
-3.6x + x2 = -0.8

The x term is -3.6x.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6x + 3.24 + x2 = -0.8 + 3.24

Reorder the terms:
3.24 + -3.6x + x2 = -0.8 + 3.24

Combine like terms: -0.8 + 3.24 = 2.44
3.24 + -3.6x + x2 = 2.44

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 2.44

Calculate the square root of the right side: 1.562049935

Break this problem into two subproblems by setting 
(x + -1.8) equal to 1.562049935 and -1.562049935.

Subproblem 1

x + -1.8 = 1.562049935 Simplifying x + -1.8 = 1.562049935 Reorder the terms: -1.8 + x = 1.562049935 Solving -1.8 + x = 1.562049935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = 1.562049935 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 1.562049935 + 1.8 x = 1.562049935 + 1.8 Combine like terms: 1.562049935 + 1.8 = 3.362049935 x = 3.362049935 Simplifying x = 3.362049935

Subproblem 2

x + -1.8 = -1.562049935 Simplifying x + -1.8 = -1.562049935 Reorder the terms: -1.8 + x = -1.562049935 Solving -1.8 + x = -1.562049935 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + x = -1.562049935 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -1.562049935 + 1.8 x = -1.562049935 + 1.8 Combine like terms: -1.562049935 + 1.8 = 0.237950065 x = 0.237950065 Simplifying x = 0.237950065

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.362049935, 0.237950065}

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