(x+4)(3x-4)=448

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Solution for (x+4)(3x-4)=448 equation:


Simplifying
(x + 4)(3x + -4) = 448

Reorder the terms:
(4 + x)(3x + -4) = 448

Reorder the terms:
(4 + x)(-4 + 3x) = 448

Multiply (4 + x) * (-4 + 3x)
(4(-4 + 3x) + x(-4 + 3x)) = 448
((-4 * 4 + 3x * 4) + x(-4 + 3x)) = 448
((-16 + 12x) + x(-4 + 3x)) = 448
(-16 + 12x + (-4 * x + 3x * x)) = 448
(-16 + 12x + (-4x + 3x2)) = 448

Combine like terms: 12x + -4x = 8x
(-16 + 8x + 3x2) = 448

Solving
-16 + 8x + 3x2 = 448

Solving for variable 'x'.

Reorder the terms:
-16 + -448 + 8x + 3x2 = 448 + -448

Combine like terms: -16 + -448 = -464
-464 + 8x + 3x2 = 448 + -448

Combine like terms: 448 + -448 = 0
-464 + 8x + 3x2 = 0

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

Divide each side by '3'.
-154.6666667 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '154.6666667' to each side of the equation.
-154.6666667 + 2.666666667x + 154.6666667 + x2 = 0 + 154.6666667

Reorder the terms:
-154.6666667 + 154.6666667 + 2.666666667x + x2 = 0 + 154.6666667

Combine like terms: -154.6666667 + 154.6666667 = 0.0000000
0.0000000 + 2.666666667x + x2 = 0 + 154.6666667
2.666666667x + x2 = 0 + 154.6666667

Combine like terms: 0 + 154.6666667 = 154.6666667
2.666666667x + x2 = 154.6666667

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 154.6666667 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 154.6666667 + 1.777777780

Combine like terms: 154.6666667 + 1.777777780 = 156.44444448
1.777777780 + 2.666666667x + x2 = 156.44444448

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 156.44444448

Calculate the square root of the right side: 12.507775361

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 12.507775361 and -12.507775361.

Subproblem 1

x + 1.333333334 = 12.507775361 Simplifying x + 1.333333334 = 12.507775361 Reorder the terms: 1.333333334 + x = 12.507775361 Solving 1.333333334 + x = 12.507775361 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 12.507775361 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 12.507775361 + -1.333333334 x = 12.507775361 + -1.333333334 Combine like terms: 12.507775361 + -1.333333334 = 11.174442027 x = 11.174442027 Simplifying x = 11.174442027

Subproblem 2

x + 1.333333334 = -12.507775361 Simplifying x + 1.333333334 = -12.507775361 Reorder the terms: 1.333333334 + x = -12.507775361 Solving 1.333333334 + x = -12.507775361 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -12.507775361 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -12.507775361 + -1.333333334 x = -12.507775361 + -1.333333334 Combine like terms: -12.507775361 + -1.333333334 = -13.841108695 x = -13.841108695 Simplifying x = -13.841108695

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.174442027, -13.841108695}

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