(3x+7)(x-3)=16

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Solution for (3x+7)(x-3)=16 equation:


Simplifying
(3x + 7)(x + -3) = 16

Reorder the terms:
(7 + 3x)(x + -3) = 16

Reorder the terms:
(7 + 3x)(-3 + x) = 16

Multiply (7 + 3x) * (-3 + x)
(7(-3 + x) + 3x * (-3 + x)) = 16
((-3 * 7 + x * 7) + 3x * (-3 + x)) = 16
((-21 + 7x) + 3x * (-3 + x)) = 16
(-21 + 7x + (-3 * 3x + x * 3x)) = 16
(-21 + 7x + (-9x + 3x2)) = 16

Combine like terms: 7x + -9x = -2x
(-21 + -2x + 3x2) = 16

Solving
-21 + -2x + 3x2 = 16

Solving for variable 'x'.

Reorder the terms:
-21 + -16 + -2x + 3x2 = 16 + -16

Combine like terms: -21 + -16 = -37
-37 + -2x + 3x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-37 + -2x + 3x2 = 0

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

Divide each side by '3'.
-12.33333333 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '12.33333333' to each side of the equation.
-12.33333333 + -0.6666666667x + 12.33333333 + x2 = 0 + 12.33333333

Reorder the terms:
-12.33333333 + 12.33333333 + -0.6666666667x + x2 = 0 + 12.33333333

Combine like terms: -12.33333333 + 12.33333333 = 0.00000000
0.00000000 + -0.6666666667x + x2 = 0 + 12.33333333
-0.6666666667x + x2 = 0 + 12.33333333

Combine like terms: 0 + 12.33333333 = 12.33333333
-0.6666666667x + x2 = 12.33333333

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 12.33333333 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 12.33333333 + 0.1111111112

Combine like terms: 12.33333333 + 0.1111111112 = 12.4444444412
0.1111111112 + -0.6666666667x + x2 = 12.4444444412

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 12.4444444412

Calculate the square root of the right side: 3.527668414

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 3.527668414 and -3.527668414.

Subproblem 1

x + -0.3333333334 = 3.527668414 Simplifying x + -0.3333333334 = 3.527668414 Reorder the terms: -0.3333333334 + x = 3.527668414 Solving -0.3333333334 + x = 3.527668414 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 3.527668414 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 3.527668414 + 0.3333333334 x = 3.527668414 + 0.3333333334 Combine like terms: 3.527668414 + 0.3333333334 = 3.8610017474 x = 3.8610017474 Simplifying x = 3.8610017474

Subproblem 2

x + -0.3333333334 = -3.527668414 Simplifying x + -0.3333333334 = -3.527668414 Reorder the terms: -0.3333333334 + x = -3.527668414 Solving -0.3333333334 + x = -3.527668414 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -3.527668414 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -3.527668414 + 0.3333333334 x = -3.527668414 + 0.3333333334 Combine like terms: -3.527668414 + 0.3333333334 = -3.1943350806 x = -3.1943350806 Simplifying x = -3.1943350806

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.8610017474, -3.1943350806}

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