(x-16)(3x+8)=400

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Solution for (x-16)(3x+8)=400 equation:


Simplifying
(x + -16)(3x + 8) = 400

Reorder the terms:
(-16 + x)(3x + 8) = 400

Reorder the terms:
(-16 + x)(8 + 3x) = 400

Multiply (-16 + x) * (8 + 3x)
(-16(8 + 3x) + x(8 + 3x)) = 400
((8 * -16 + 3x * -16) + x(8 + 3x)) = 400
((-128 + -48x) + x(8 + 3x)) = 400
(-128 + -48x + (8 * x + 3x * x)) = 400
(-128 + -48x + (8x + 3x2)) = 400

Combine like terms: -48x + 8x = -40x
(-128 + -40x + 3x2) = 400

Solving
-128 + -40x + 3x2 = 400

Solving for variable 'x'.

Reorder the terms:
-128 + -400 + -40x + 3x2 = 400 + -400

Combine like terms: -128 + -400 = -528
-528 + -40x + 3x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-528 + -40x + 3x2 = 0

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

Divide each side by '3'.
-176 + -13.33333333x + x2 = 0

Move the constant term to the right:

Add '176' to each side of the equation.
-176 + -13.33333333x + 176 + x2 = 0 + 176

Reorder the terms:
-176 + 176 + -13.33333333x + x2 = 0 + 176

Combine like terms: -176 + 176 = 0
0 + -13.33333333x + x2 = 0 + 176
-13.33333333x + x2 = 0 + 176

Combine like terms: 0 + 176 = 176
-13.33333333x + x2 = 176

The x term is -13.33333333x.  Take half its coefficient (-6.666666665).
Square it (44.44444442) and add it to both sides.

Add '44.44444442' to each side of the equation.
-13.33333333x + 44.44444442 + x2 = 176 + 44.44444442

Reorder the terms:
44.44444442 + -13.33333333x + x2 = 176 + 44.44444442

Combine like terms: 176 + 44.44444442 = 220.44444442
44.44444442 + -13.33333333x + x2 = 220.44444442

Factor a perfect square on the left side:
(x + -6.666666665)(x + -6.666666665) = 220.44444442

Calculate the square root of the right side: 14.847371633

Break this problem into two subproblems by setting 
(x + -6.666666665) equal to 14.847371633 and -14.847371633.

Subproblem 1

x + -6.666666665 = 14.847371633 Simplifying x + -6.666666665 = 14.847371633 Reorder the terms: -6.666666665 + x = 14.847371633 Solving -6.666666665 + x = 14.847371633 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = 14.847371633 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = 14.847371633 + 6.666666665 x = 14.847371633 + 6.666666665 Combine like terms: 14.847371633 + 6.666666665 = 21.514038298 x = 21.514038298 Simplifying x = 21.514038298

Subproblem 2

x + -6.666666665 = -14.847371633 Simplifying x + -6.666666665 = -14.847371633 Reorder the terms: -6.666666665 + x = -14.847371633 Solving -6.666666665 + x = -14.847371633 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = -14.847371633 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = -14.847371633 + 6.666666665 x = -14.847371633 + 6.666666665 Combine like terms: -14.847371633 + 6.666666665 = -8.180704968 x = -8.180704968 Simplifying x = -8.180704968

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.514038298, -8.180704968}

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