36=.5x(x-5)

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Solution for 36=.5x(x-5) equation:


Simplifying
36 = 0.5x(x + -5)

Reorder the terms:
36 = 0.5x(-5 + x)
36 = (-5 * 0.5x + x * 0.5x)
36 = (-2.5x + 0.5x2)

Solving
36 = -2.5x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
36 + 2.5x + -0.5x2 = -2.5x + 2.5x + 0.5x2 + -0.5x2

Combine like terms: -2.5x + 2.5x = 0.0
36 + 2.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
36 + 2.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
36 + 2.5x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-72 + -5x + x2 = 0

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -5x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + -5x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -5x + x2 = 0 + 72
-5x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
-5x + x2 = 72

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 72 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 72 + 6.25

Combine like terms: 72 + 6.25 = 78.25
6.25 + -5x + x2 = 78.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(x + -2.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

x + -2.5 = 8.845903006 Simplifying x + -2.5 = 8.845903006 Reorder the terms: -2.5 + x = 8.845903006 Solving -2.5 + x = 8.845903006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 8.845903006 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 8.845903006 + 2.5 x = 8.845903006 + 2.5 Combine like terms: 8.845903006 + 2.5 = 11.345903006 x = 11.345903006 Simplifying x = 11.345903006

Subproblem 2

x + -2.5 = -8.845903006 Simplifying x + -2.5 = -8.845903006 Reorder the terms: -2.5 + x = -8.845903006 Solving -2.5 + x = -8.845903006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -8.845903006 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -8.845903006 + 2.5 x = -8.845903006 + 2.5 Combine like terms: -8.845903006 + 2.5 = -6.345903006 x = -6.345903006 Simplifying x = -6.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.345903006, -6.345903006}

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