(x*x)-20x-100=68

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Solution for (x*x)-20x-100=68 equation:


Simplifying
(x * x) + -20x + -100 = 68

Multiply x * x
(x2) + -20x + -100 = 68
x2 + -20x + -100 = 68

Reorder the terms:
-100 + -20x + x2 = 68

Solving
-100 + -20x + x2 = 68

Solving for variable 'x'.

Reorder the terms:
-100 + -68 + -20x + x2 = 68 + -68

Combine like terms: -100 + -68 = -168
-168 + -20x + x2 = 68 + -68

Combine like terms: 68 + -68 = 0
-168 + -20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '168' to each side of the equation.
-168 + -20x + 168 + x2 = 0 + 168

Reorder the terms:
-168 + 168 + -20x + x2 = 0 + 168

Combine like terms: -168 + 168 = 0
0 + -20x + x2 = 0 + 168
-20x + x2 = 0 + 168

Combine like terms: 0 + 168 = 168
-20x + x2 = 168

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 168 + 100

Reorder the terms:
100 + -20x + x2 = 168 + 100

Combine like terms: 168 + 100 = 268
100 + -20x + x2 = 268

Factor a perfect square on the left side:
(x + -10)(x + -10) = 268

Calculate the square root of the right side: 16.370705544

Break this problem into two subproblems by setting 
(x + -10) equal to 16.370705544 and -16.370705544.

Subproblem 1

x + -10 = 16.370705544 Simplifying x + -10 = 16.370705544 Reorder the terms: -10 + x = 16.370705544 Solving -10 + x = 16.370705544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 16.370705544 + 10 Combine like terms: -10 + 10 = 0 0 + x = 16.370705544 + 10 x = 16.370705544 + 10 Combine like terms: 16.370705544 + 10 = 26.370705544 x = 26.370705544 Simplifying x = 26.370705544

Subproblem 2

x + -10 = -16.370705544 Simplifying x + -10 = -16.370705544 Reorder the terms: -10 + x = -16.370705544 Solving -10 + x = -16.370705544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -16.370705544 + 10 Combine like terms: -10 + 10 = 0 0 + x = -16.370705544 + 10 x = -16.370705544 + 10 Combine like terms: -16.370705544 + 10 = -6.370705544 x = -6.370705544 Simplifying x = -6.370705544

Solution

The solution to the problem is based on the solutions from the subproblems. x = {26.370705544, -6.370705544}

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