(0.5x-10)(0.5x-10)=0

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Solution for (0.5x-10)(0.5x-10)=0 equation:


Simplifying
(0.5x + -10)(0.5x + -10) = 0

Reorder the terms:
(-10 + 0.5x)(0.5x + -10) = 0

Reorder the terms:
(-10 + 0.5x)(-10 + 0.5x) = 0

Multiply (-10 + 0.5x) * (-10 + 0.5x)
(-10(-10 + 0.5x) + 0.5x * (-10 + 0.5x)) = 0
((-10 * -10 + 0.5x * -10) + 0.5x * (-10 + 0.5x)) = 0
((100 + -5x) + 0.5x * (-10 + 0.5x)) = 0
(100 + -5x + (-10 * 0.5x + 0.5x * 0.5x)) = 0
(100 + -5x + (-5x + 0.25x2)) = 0

Combine like terms: -5x + -5x = -10x
(100 + -10x + 0.25x2) = 0

Solving
100 + -10x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
400 + -40x + x2 = 0

Move the constant term to the right:

Add '-400' to each side of the equation.
400 + -40x + -400 + x2 = 0 + -400

Reorder the terms:
400 + -400 + -40x + x2 = 0 + -400

Combine like terms: 400 + -400 = 0
0 + -40x + x2 = 0 + -400
-40x + x2 = 0 + -400

Combine like terms: 0 + -400 = -400
-40x + x2 = -400

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = -400 + 400

Reorder the terms:
400 + -40x + x2 = -400 + 400

Combine like terms: -400 + 400 = 0
400 + -40x + x2 = 0

Factor a perfect square on the left side:
(x + -20)(x + -20) = 0

Calculate the square root of the right side: 0

Break this problem into two subproblems by setting 
(x + -20) equal to 0 and 0.

Subproblem 1

x + -20 = 0 Simplifying x + -20 = 0 Reorder the terms: -20 + x = 0 Solving -20 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 0 + 20 Combine like terms: -20 + 20 = 0 0 + x = 0 + 20 x = 0 + 20 Combine like terms: 0 + 20 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + -20 = 0 Simplifying x + -20 = 0 Reorder the terms: -20 + x = 0 Solving -20 + x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 0 + 20 Combine like terms: -20 + 20 = 0 0 + x = 0 + 20 x = 0 + 20 Combine like terms: 0 + 20 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, 20}

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