3-4x(25-2x)=16x+x-300

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Solution for 3-4x(25-2x)=16x+x-300 equation:


Simplifying
3 + -4x(25 + -2x) = 16x + x + -300
3 + (25 * -4x + -2x * -4x) = 16x + x + -300
3 + (-100x + 8x2) = 16x + x + -300

Reorder the terms:
3 + -100x + 8x2 = -300 + 16x + x

Combine like terms: 16x + x = 17x
3 + -100x + 8x2 = -300 + 17x

Solving
3 + -100x + 8x2 = -300 + 17x

Solving for variable 'x'.

Reorder the terms:
3 + 300 + -100x + -17x + 8x2 = -300 + 17x + 300 + -17x

Combine like terms: 3 + 300 = 303
303 + -100x + -17x + 8x2 = -300 + 17x + 300 + -17x

Combine like terms: -100x + -17x = -117x
303 + -117x + 8x2 = -300 + 17x + 300 + -17x

Reorder the terms:
303 + -117x + 8x2 = -300 + 300 + 17x + -17x

Combine like terms: -300 + 300 = 0
303 + -117x + 8x2 = 0 + 17x + -17x
303 + -117x + 8x2 = 17x + -17x

Combine like terms: 17x + -17x = 0
303 + -117x + 8x2 = 0

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

Divide each side by '8'.
37.875 + -14.625x + x2 = 0

Move the constant term to the right:

Add '-37.875' to each side of the equation.
37.875 + -14.625x + -37.875 + x2 = 0 + -37.875

Reorder the terms:
37.875 + -37.875 + -14.625x + x2 = 0 + -37.875

Combine like terms: 37.875 + -37.875 = 0.000
0.000 + -14.625x + x2 = 0 + -37.875
-14.625x + x2 = 0 + -37.875

Combine like terms: 0 + -37.875 = -37.875
-14.625x + x2 = -37.875

The x term is -14.625x.  Take half its coefficient (-7.3125).
Square it (53.47265625) and add it to both sides.

Add '53.47265625' to each side of the equation.
-14.625x + 53.47265625 + x2 = -37.875 + 53.47265625

Reorder the terms:
53.47265625 + -14.625x + x2 = -37.875 + 53.47265625

Combine like terms: -37.875 + 53.47265625 = 15.59765625
53.47265625 + -14.625x + x2 = 15.59765625

Factor a perfect square on the left side:
(x + -7.3125)(x + -7.3125) = 15.59765625

Calculate the square root of the right side: 3.949386819

Break this problem into two subproblems by setting 
(x + -7.3125) equal to 3.949386819 and -3.949386819.

Subproblem 1

x + -7.3125 = 3.949386819 Simplifying x + -7.3125 = 3.949386819 Reorder the terms: -7.3125 + x = 3.949386819 Solving -7.3125 + x = 3.949386819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.3125' to each side of the equation. -7.3125 + 7.3125 + x = 3.949386819 + 7.3125 Combine like terms: -7.3125 + 7.3125 = 0.0000 0.0000 + x = 3.949386819 + 7.3125 x = 3.949386819 + 7.3125 Combine like terms: 3.949386819 + 7.3125 = 11.261886819 x = 11.261886819 Simplifying x = 11.261886819

Subproblem 2

x + -7.3125 = -3.949386819 Simplifying x + -7.3125 = -3.949386819 Reorder the terms: -7.3125 + x = -3.949386819 Solving -7.3125 + x = -3.949386819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.3125' to each side of the equation. -7.3125 + 7.3125 + x = -3.949386819 + 7.3125 Combine like terms: -7.3125 + 7.3125 = 0.0000 0.0000 + x = -3.949386819 + 7.3125 x = -3.949386819 + 7.3125 Combine like terms: -3.949386819 + 7.3125 = 3.363113181 x = 3.363113181 Simplifying x = 3.363113181

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.261886819, 3.363113181}

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