276=x(x-20)

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Solution for 276=x(x-20) equation:


Simplifying
276 = x(x + -20)

Reorder the terms:
276 = x(-20 + x)
276 = (-20 * x + x * x)
276 = (-20x + x2)

Solving
276 = -20x + x2

Solving for variable 'x'.

Reorder the terms:
276 + 20x + -1x2 = -20x + 20x + x2 + -1x2

Combine like terms: -20x + 20x = 0
276 + 20x + -1x2 = 0 + x2 + -1x2
276 + 20x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
276 + 20x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-276 + -20x + x2 = 0

Move the constant term to the right:

Add '276' to each side of the equation.
-276 + -20x + 276 + x2 = 0 + 276

Reorder the terms:
-276 + 276 + -20x + x2 = 0 + 276

Combine like terms: -276 + 276 = 0
0 + -20x + x2 = 0 + 276
-20x + x2 = 0 + 276

Combine like terms: 0 + 276 = 276
-20x + x2 = 276

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 = 276 + 100

Reorder the terms:
100 + -20x + x2 = 276 + 100

Combine like terms: 276 + 100 = 376
100 + -20x + x2 = 376

Factor a perfect square on the left side:
(x + -10)(x + -10) = 376

Calculate the square root of the right side: 19.39071943

Break this problem into two subproblems by setting 
(x + -10) equal to 19.39071943 and -19.39071943.

Subproblem 1

x + -10 = 19.39071943 Simplifying x + -10 = 19.39071943 Reorder the terms: -10 + x = 19.39071943 Solving -10 + x = 19.39071943 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 = 19.39071943 + 10 Combine like terms: -10 + 10 = 0 0 + x = 19.39071943 + 10 x = 19.39071943 + 10 Combine like terms: 19.39071943 + 10 = 29.39071943 x = 29.39071943 Simplifying x = 29.39071943

Subproblem 2

x + -10 = -19.39071943 Simplifying x + -10 = -19.39071943 Reorder the terms: -10 + x = -19.39071943 Solving -10 + x = -19.39071943 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 = -19.39071943 + 10 Combine like terms: -10 + 10 = 0 0 + x = -19.39071943 + 10 x = -19.39071943 + 10 Combine like terms: -19.39071943 + 10 = -9.39071943 x = -9.39071943 Simplifying x = -9.39071943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {29.39071943, -9.39071943}

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