1250=(.1)*x(300-x)

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Solution for 1250=(.1)*x(300-x) equation:


Simplifying
1250 = (0.1) * x(300 + -1x)
1250 = (300 * 0.1x + -1x * 0.1x)
1250 = (30x + -0.1x2)

Solving
1250 = 30x + -0.1x2

Solving for variable 'x'.

Reorder the terms:
1250 + -30x + 0.1x2 = 30x + -30x + -0.1x2 + 0.1x2

Combine like terms: 30x + -30x = 0
1250 + -30x + 0.1x2 = 0 + -0.1x2 + 0.1x2
1250 + -30x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
1250 + -30x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
12500 + -300x + x2 = 0

Move the constant term to the right:

Add '-12500' to each side of the equation.
12500 + -300x + -12500 + x2 = 0 + -12500

Reorder the terms:
12500 + -12500 + -300x + x2 = 0 + -12500

Combine like terms: 12500 + -12500 = 0
0 + -300x + x2 = 0 + -12500
-300x + x2 = 0 + -12500

Combine like terms: 0 + -12500 = -12500
-300x + x2 = -12500

The x term is -300x.  Take half its coefficient (-150).
Square it (22500) and add it to both sides.

Add '22500' to each side of the equation.
-300x + 22500 + x2 = -12500 + 22500

Reorder the terms:
22500 + -300x + x2 = -12500 + 22500

Combine like terms: -12500 + 22500 = 10000
22500 + -300x + x2 = 10000

Factor a perfect square on the left side:
(x + -150)(x + -150) = 10000

Calculate the square root of the right side: 100

Break this problem into two subproblems by setting 
(x + -150) equal to 100 and -100.

Subproblem 1

x + -150 = 100 Simplifying x + -150 = 100 Reorder the terms: -150 + x = 100 Solving -150 + x = 100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '150' to each side of the equation. -150 + 150 + x = 100 + 150 Combine like terms: -150 + 150 = 0 0 + x = 100 + 150 x = 100 + 150 Combine like terms: 100 + 150 = 250 x = 250 Simplifying x = 250

Subproblem 2

x + -150 = -100 Simplifying x + -150 = -100 Reorder the terms: -150 + x = -100 Solving -150 + x = -100 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '150' to each side of the equation. -150 + 150 + x = -100 + 150 Combine like terms: -150 + 150 = 0 0 + x = -100 + 150 x = -100 + 150 Combine like terms: -100 + 150 = 50 x = 50 Simplifying x = 50

Solution

The solution to the problem is based on the solutions from the subproblems. x = {250, 50}

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