(5x-2)x=18

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Solution for (5x-2)x=18 equation:


Simplifying
(5x + -2) * x = 18

Reorder the terms:
(-2 + 5x) * x = 18

Reorder the terms for easier multiplication:
x(-2 + 5x) = 18
(-2 * x + 5x * x) = 18
(-2x + 5x2) = 18

Solving
-2x + 5x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + -2x + 5x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -2x + 5x2 = 0

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

Divide each side by '5'.
-3.6 + -0.4x + x2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -0.4x + 3.6 + x2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -0.4x + x2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -0.4x + x2 = 0 + 3.6
-0.4x + x2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-0.4x + x2 = 3.6

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 3.6 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 3.6 + 0.04

Combine like terms: 3.6 + 0.04 = 3.64
0.04 + -0.4x + x2 = 3.64

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 3.64

Calculate the square root of the right side: 1.907878403

Break this problem into two subproblems by setting 
(x + -0.2) equal to 1.907878403 and -1.907878403.

Subproblem 1

x + -0.2 = 1.907878403 Simplifying x + -0.2 = 1.907878403 Reorder the terms: -0.2 + x = 1.907878403 Solving -0.2 + x = 1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 1.907878403 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 1.907878403 + 0.2 x = 1.907878403 + 0.2 Combine like terms: 1.907878403 + 0.2 = 2.107878403 x = 2.107878403 Simplifying x = 2.107878403

Subproblem 2

x + -0.2 = -1.907878403 Simplifying x + -0.2 = -1.907878403 Reorder the terms: -0.2 + x = -1.907878403 Solving -0.2 + x = -1.907878403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -1.907878403 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -1.907878403 + 0.2 x = -1.907878403 + 0.2 Combine like terms: -1.907878403 + 0.2 = -1.707878403 x = -1.707878403 Simplifying x = -1.707878403

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.107878403, -1.707878403}

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