(500-25x)(2+0.25x)=0

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Solution for (500-25x)(2+0.25x)=0 equation:


Simplifying
(500 + -25x)(2 + 0.25x) = 0

Multiply (500 + -25x) * (2 + 0.25x)
(500(2 + 0.25x) + -25x * (2 + 0.25x)) = 0
((2 * 500 + 0.25x * 500) + -25x * (2 + 0.25x)) = 0
((1000 + 125x) + -25x * (2 + 0.25x)) = 0
(1000 + 125x + (2 * -25x + 0.25x * -25x)) = 0
(1000 + 125x + (-50x + -6.25x2)) = 0

Combine like terms: 125x + -50x = 75x
(1000 + 75x + -6.25x2) = 0

Solving
1000 + 75x + -6.25x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-6.25 the coefficient of the squared term: 

Divide each side by '-6.25'.
-160 + -12x + x2 = 0

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + -12x + 160 + x2 = 0 + 160

Reorder the terms:
-160 + 160 + -12x + x2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + -12x + x2 = 0 + 160
-12x + x2 = 0 + 160

Combine like terms: 0 + 160 = 160
-12x + x2 = 160

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 160 + 36

Reorder the terms:
36 + -12x + x2 = 160 + 36

Combine like terms: 160 + 36 = 196
36 + -12x + x2 = 196

Factor a perfect square on the left side:
(x + -6)(x + -6) = 196

Calculate the square root of the right side: 14

Break this problem into two subproblems by setting 
(x + -6) equal to 14 and -14.

Subproblem 1

x + -6 = 14 Simplifying x + -6 = 14 Reorder the terms: -6 + x = 14 Solving -6 + x = 14 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 14 + 6 Combine like terms: -6 + 6 = 0 0 + x = 14 + 6 x = 14 + 6 Combine like terms: 14 + 6 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + -6 = -14 Simplifying x + -6 = -14 Reorder the terms: -6 + x = -14 Solving -6 + x = -14 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -14 + 6 Combine like terms: -6 + 6 = 0 0 + x = -14 + 6 x = -14 + 6 Combine like terms: -14 + 6 = -8 x = -8 Simplifying x = -8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, -8}

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