x(x-10)-18(x+10)=0

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Solution for x(x-10)-18(x+10)=0 equation:


Simplifying
x(x + -10) + -18(x + 10) = 0

Reorder the terms:
x(-10 + x) + -18(x + 10) = 0
(-10 * x + x * x) + -18(x + 10) = 0
(-10x + x2) + -18(x + 10) = 0

Reorder the terms:
-10x + x2 + -18(10 + x) = 0
-10x + x2 + (10 * -18 + x * -18) = 0
-10x + x2 + (-180 + -18x) = 0

Reorder the terms:
-180 + -10x + -18x + x2 = 0

Combine like terms: -10x + -18x = -28x
-180 + -28x + x2 = 0

Solving
-180 + -28x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + -28x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + -28x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + -28x + x2 = 0 + 180
-28x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
-28x + x2 = 180

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = 180 + 196

Reorder the terms:
196 + -28x + x2 = 180 + 196

Combine like terms: 180 + 196 = 376
196 + -28x + x2 = 376

Factor a perfect square on the left side:
(x + -14)(x + -14) = 376

Calculate the square root of the right side: 19.39071943

Break this problem into two subproblems by setting 
(x + -14) equal to 19.39071943 and -19.39071943.

Subproblem 1

x + -14 = 19.39071943 Simplifying x + -14 = 19.39071943 Reorder the terms: -14 + x = 19.39071943 Solving -14 + x = 19.39071943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 19.39071943 + 14 Combine like terms: -14 + 14 = 0 0 + x = 19.39071943 + 14 x = 19.39071943 + 14 Combine like terms: 19.39071943 + 14 = 33.39071943 x = 33.39071943 Simplifying x = 33.39071943

Subproblem 2

x + -14 = -19.39071943 Simplifying x + -14 = -19.39071943 Reorder the terms: -14 + x = -19.39071943 Solving -14 + x = -19.39071943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -19.39071943 + 14 Combine like terms: -14 + 14 = 0 0 + x = -19.39071943 + 14 x = -19.39071943 + 14 Combine like terms: -19.39071943 + 14 = -5.39071943 x = -5.39071943 Simplifying x = -5.39071943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {33.39071943, -5.39071943}

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