5x(x-18)=6-2(x+15)

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Solution for 5x(x-18)=6-2(x+15) equation:


Simplifying
5x(x + -18) = 6 + -2(x + 15)

Reorder the terms:
5x(-18 + x) = 6 + -2(x + 15)
(-18 * 5x + x * 5x) = 6 + -2(x + 15)
(-90x + 5x2) = 6 + -2(x + 15)

Reorder the terms:
-90x + 5x2 = 6 + -2(15 + x)
-90x + 5x2 = 6 + (15 * -2 + x * -2)
-90x + 5x2 = 6 + (-30 + -2x)

Combine like terms: 6 + -30 = -24
-90x + 5x2 = -24 + -2x

Solving
-90x + 5x2 = -24 + -2x

Solving for variable 'x'.

Reorder the terms:
24 + -90x + 2x + 5x2 = -24 + -2x + 24 + 2x

Combine like terms: -90x + 2x = -88x
24 + -88x + 5x2 = -24 + -2x + 24 + 2x

Reorder the terms:
24 + -88x + 5x2 = -24 + 24 + -2x + 2x

Combine like terms: -24 + 24 = 0
24 + -88x + 5x2 = 0 + -2x + 2x
24 + -88x + 5x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
24 + -88x + 5x2 = 0

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

Divide each side by '5'.
4.8 + -17.6x + x2 = 0

Move the constant term to the right:

Add '-4.8' to each side of the equation.
4.8 + -17.6x + -4.8 + x2 = 0 + -4.8

Reorder the terms:
4.8 + -4.8 + -17.6x + x2 = 0 + -4.8

Combine like terms: 4.8 + -4.8 = 0.0
0.0 + -17.6x + x2 = 0 + -4.8
-17.6x + x2 = 0 + -4.8

Combine like terms: 0 + -4.8 = -4.8
-17.6x + x2 = -4.8

The x term is -17.6x.  Take half its coefficient (-8.8).
Square it (77.44) and add it to both sides.

Add '77.44' to each side of the equation.
-17.6x + 77.44 + x2 = -4.8 + 77.44

Reorder the terms:
77.44 + -17.6x + x2 = -4.8 + 77.44

Combine like terms: -4.8 + 77.44 = 72.64
77.44 + -17.6x + x2 = 72.64

Factor a perfect square on the left side:
(x + -8.8)(x + -8.8) = 72.64

Calculate the square root of the right side: 8.522910301

Break this problem into two subproblems by setting 
(x + -8.8) equal to 8.522910301 and -8.522910301.

Subproblem 1

x + -8.8 = 8.522910301 Simplifying x + -8.8 = 8.522910301 Reorder the terms: -8.8 + x = 8.522910301 Solving -8.8 + x = 8.522910301 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.8' to each side of the equation. -8.8 + 8.8 + x = 8.522910301 + 8.8 Combine like terms: -8.8 + 8.8 = 0.0 0.0 + x = 8.522910301 + 8.8 x = 8.522910301 + 8.8 Combine like terms: 8.522910301 + 8.8 = 17.322910301 x = 17.322910301 Simplifying x = 17.322910301

Subproblem 2

x + -8.8 = -8.522910301 Simplifying x + -8.8 = -8.522910301 Reorder the terms: -8.8 + x = -8.522910301 Solving -8.8 + x = -8.522910301 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.8' to each side of the equation. -8.8 + 8.8 + x = -8.522910301 + 8.8 Combine like terms: -8.8 + 8.8 = 0.0 0.0 + x = -8.522910301 + 8.8 x = -8.522910301 + 8.8 Combine like terms: -8.522910301 + 8.8 = 0.277089699 x = 0.277089699 Simplifying x = 0.277089699

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.322910301, 0.277089699}

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