(3x+4)(x-4)=10

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Solution for (3x+4)(x-4)=10 equation:


Simplifying
(3x + 4)(x + -4) = 10

Reorder the terms:
(4 + 3x)(x + -4) = 10

Reorder the terms:
(4 + 3x)(-4 + x) = 10

Multiply (4 + 3x) * (-4 + x)
(4(-4 + x) + 3x * (-4 + x)) = 10
((-4 * 4 + x * 4) + 3x * (-4 + x)) = 10
((-16 + 4x) + 3x * (-4 + x)) = 10
(-16 + 4x + (-4 * 3x + x * 3x)) = 10
(-16 + 4x + (-12x + 3x2)) = 10

Combine like terms: 4x + -12x = -8x
(-16 + -8x + 3x2) = 10

Solving
-16 + -8x + 3x2 = 10

Solving for variable 'x'.

Reorder the terms:
-16 + -10 + -8x + 3x2 = 10 + -10

Combine like terms: -16 + -10 = -26
-26 + -8x + 3x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-26 + -8x + 3x2 = 0

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

Divide each side by '3'.
-8.666666667 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '8.666666667' to each side of the equation.
-8.666666667 + -2.666666667x + 8.666666667 + x2 = 0 + 8.666666667

Reorder the terms:
-8.666666667 + 8.666666667 + -2.666666667x + x2 = 0 + 8.666666667

Combine like terms: -8.666666667 + 8.666666667 = 0.000000000
0.000000000 + -2.666666667x + x2 = 0 + 8.666666667
-2.666666667x + x2 = 0 + 8.666666667

Combine like terms: 0 + 8.666666667 = 8.666666667
-2.666666667x + x2 = 8.666666667

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 = 8.666666667 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 8.666666667 + 1.777777780

Combine like terms: 8.666666667 + 1.777777780 = 10.444444447
1.777777780 + -2.666666667x + x2 = 10.444444447

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 10.444444447

Calculate the square root of the right side: 3.231786572

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 3.231786572 and -3.231786572.

Subproblem 1

x + -1.333333334 = 3.231786572 Simplifying x + -1.333333334 = 3.231786572 Reorder the terms: -1.333333334 + x = 3.231786572 Solving -1.333333334 + x = 3.231786572 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 = 3.231786572 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 3.231786572 + 1.333333334 x = 3.231786572 + 1.333333334 Combine like terms: 3.231786572 + 1.333333334 = 4.565119906 x = 4.565119906 Simplifying x = 4.565119906

Subproblem 2

x + -1.333333334 = -3.231786572 Simplifying x + -1.333333334 = -3.231786572 Reorder the terms: -1.333333334 + x = -3.231786572 Solving -1.333333334 + x = -3.231786572 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 = -3.231786572 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -3.231786572 + 1.333333334 x = -3.231786572 + 1.333333334 Combine like terms: -3.231786572 + 1.333333334 = -1.898453238 x = -1.898453238 Simplifying x = -1.898453238

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.565119906, -1.898453238}

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