.04x+.07x(15000-x)=900

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Solution for .04x+.07x(15000-x)=900 equation:


Simplifying
0.04x + 0.07x(15000 + -1x) = 900
0.04x + (15000 * 0.07x + -1x * 0.07x) = 900
0.04x + (1050x + -0.07x2) = 900

Combine like terms: 0.04x + 1050x = 1050.04x
1050.04x + -0.07x2 = 900

Solving
1050.04x + -0.07x2 = 900

Solving for variable 'x'.

Reorder the terms:
-900 + 1050.04x + -0.07x2 = 900 + -900

Combine like terms: 900 + -900 = 0
-900 + 1050.04x + -0.07x2 = 0

Begin completing the square.  Divide all terms by
-0.07 the coefficient of the squared term: 

Divide each side by '-0.07'.
12857.14286 + -15000.57143x + x2 = 0

Move the constant term to the right:

Add '-12857.14286' to each side of the equation.
12857.14286 + -15000.57143x + -12857.14286 + x2 = 0 + -12857.14286

Reorder the terms:
12857.14286 + -12857.14286 + -15000.57143x + x2 = 0 + -12857.14286

Combine like terms: 12857.14286 + -12857.14286 = 0.00000
0.00000 + -15000.57143x + x2 = 0 + -12857.14286
-15000.57143x + x2 = 0 + -12857.14286

Combine like terms: 0 + -12857.14286 = -12857.14286
-15000.57143x + x2 = -12857.14286

The x term is -15000.57143x.  Take half its coefficient (-7500.285715).
Square it (56254285.81) and add it to both sides.

Add '56254285.81' to each side of the equation.
-15000.57143x + 56254285.81 + x2 = -12857.14286 + 56254285.81

Reorder the terms:
56254285.81 + -15000.57143x + x2 = -12857.14286 + 56254285.81

Combine like terms: -12857.14286 + 56254285.81 = 56241428.66714
56254285.81 + -15000.57143x + x2 = 56241428.66714

Factor a perfect square on the left side:
(x + -7500.285715)(x + -7500.285715) = 56241428.66714

Calculate the square root of the right side: 7499.428556039

Break this problem into two subproblems by setting 
(x + -7500.285715) equal to 7499.428556039 and -7499.428556039.

Subproblem 1

x + -7500.285715 = 7499.428556039 Simplifying x + -7500.285715 = 7499.428556039 Reorder the terms: -7500.285715 + x = 7499.428556039 Solving -7500.285715 + x = 7499.428556039 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7500.285715' to each side of the equation. -7500.285715 + 7500.285715 + x = 7499.428556039 + 7500.285715 Combine like terms: -7500.285715 + 7500.285715 = 0.000000 0.000000 + x = 7499.428556039 + 7500.285715 x = 7499.428556039 + 7500.285715 Combine like terms: 7499.428556039 + 7500.285715 = 14999.714271039 x = 14999.714271039 Simplifying x = 14999.714271039

Subproblem 2

x + -7500.285715 = -7499.428556039 Simplifying x + -7500.285715 = -7499.428556039 Reorder the terms: -7500.285715 + x = -7499.428556039 Solving -7500.285715 + x = -7499.428556039 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7500.285715' to each side of the equation. -7500.285715 + 7500.285715 + x = -7499.428556039 + 7500.285715 Combine like terms: -7500.285715 + 7500.285715 = 0.000000 0.000000 + x = -7499.428556039 + 7500.285715 x = -7499.428556039 + 7500.285715 Combine like terms: -7499.428556039 + 7500.285715 = 0.857158961 x = 0.857158961 Simplifying x = 0.857158961

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14999.714271039, 0.857158961}

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