7x+10x(200-x)=1625

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Solution for 7x+10x(200-x)=1625 equation:


Simplifying
7x + 10x(200 + -1x) = 1625
7x + (200 * 10x + -1x * 10x) = 1625
7x + (2000x + -10x2) = 1625

Combine like terms: 7x + 2000x = 2007x
2007x + -10x2 = 1625

Solving
2007x + -10x2 = 1625

Solving for variable 'x'.

Reorder the terms:
-1625 + 2007x + -10x2 = 1625 + -1625

Combine like terms: 1625 + -1625 = 0
-1625 + 2007x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
162.5 + -200.7x + x2 = 0.0

Move the constant term to the right:

Add '-162.5' to each side of the equation.
162.5 + -200.7x + -162.5 + x2 = 0.0 + -162.5

Reorder the terms:
162.5 + -162.5 + -200.7x + x2 = 0.0 + -162.5

Combine like terms: 162.5 + -162.5 = 0.0
0.0 + -200.7x + x2 = 0.0 + -162.5
-200.7x + x2 = 0.0 + -162.5

Combine like terms: 0.0 + -162.5 = -162.5
-200.7x + x2 = -162.5

The x term is -200.7x.  Take half its coefficient (-100.35).
Square it (10070.1225) and add it to both sides.

Add '10070.1225' to each side of the equation.
-200.7x + 10070.1225 + x2 = -162.5 + 10070.1225

Reorder the terms:
10070.1225 + -200.7x + x2 = -162.5 + 10070.1225

Combine like terms: -162.5 + 10070.1225 = 9907.6225
10070.1225 + -200.7x + x2 = 9907.6225

Factor a perfect square on the left side:
(x + -100.35)(x + -100.35) = 9907.6225

Calculate the square root of the right side: 99.537040844

Break this problem into two subproblems by setting 
(x + -100.35) equal to 99.537040844 and -99.537040844.

Subproblem 1

x + -100.35 = 99.537040844 Simplifying x + -100.35 = 99.537040844 Reorder the terms: -100.35 + x = 99.537040844 Solving -100.35 + x = 99.537040844 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100.35' to each side of the equation. -100.35 + 100.35 + x = 99.537040844 + 100.35 Combine like terms: -100.35 + 100.35 = 0.00 0.00 + x = 99.537040844 + 100.35 x = 99.537040844 + 100.35 Combine like terms: 99.537040844 + 100.35 = 199.887040844 x = 199.887040844 Simplifying x = 199.887040844

Subproblem 2

x + -100.35 = -99.537040844 Simplifying x + -100.35 = -99.537040844 Reorder the terms: -100.35 + x = -99.537040844 Solving -100.35 + x = -99.537040844 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100.35' to each side of the equation. -100.35 + 100.35 + x = -99.537040844 + 100.35 Combine like terms: -100.35 + 100.35 = 0.00 0.00 + x = -99.537040844 + 100.35 x = -99.537040844 + 100.35 Combine like terms: -99.537040844 + 100.35 = 0.812959156 x = 0.812959156 Simplifying x = 0.812959156

Solution

The solution to the problem is based on the solutions from the subproblems. x = {199.887040844, 0.812959156}

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