4x(3x-8)=25

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Solution for 4x(3x-8)=25 equation:


Simplifying
4x(3x + -8) = 25

Reorder the terms:
4x(-8 + 3x) = 25
(-8 * 4x + 3x * 4x) = 25
(-32x + 12x2) = 25

Solving
-32x + 12x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + -32x + 12x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -32x + 12x2 = 0

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

Divide each side by '12'.
-2.083333333 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '2.083333333' to each side of the equation.
-2.083333333 + -2.666666667x + 2.083333333 + x2 = 0 + 2.083333333

Reorder the terms:
-2.083333333 + 2.083333333 + -2.666666667x + x2 = 0 + 2.083333333

Combine like terms: -2.083333333 + 2.083333333 = 0.000000000
0.000000000 + -2.666666667x + x2 = 0 + 2.083333333
-2.666666667x + x2 = 0 + 2.083333333

Combine like terms: 0 + 2.083333333 = 2.083333333
-2.666666667x + x2 = 2.083333333

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 = 2.083333333 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 2.083333333 + 1.777777780

Combine like terms: 2.083333333 + 1.777777780 = 3.861111113
1.777777780 + -2.666666667x + x2 = 3.861111113

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 3.861111113

Calculate the square root of the right side: 1.964971021

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 1.964971021 and -1.964971021.

Subproblem 1

x + -1.333333334 = 1.964971021 Simplifying x + -1.333333334 = 1.964971021 Reorder the terms: -1.333333334 + x = 1.964971021 Solving -1.333333334 + x = 1.964971021 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 = 1.964971021 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 1.964971021 + 1.333333334 x = 1.964971021 + 1.333333334 Combine like terms: 1.964971021 + 1.333333334 = 3.298304355 x = 3.298304355 Simplifying x = 3.298304355

Subproblem 2

x + -1.333333334 = -1.964971021 Simplifying x + -1.333333334 = -1.964971021 Reorder the terms: -1.333333334 + x = -1.964971021 Solving -1.333333334 + x = -1.964971021 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 = -1.964971021 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -1.964971021 + 1.333333334 x = -1.964971021 + 1.333333334 Combine like terms: -1.964971021 + 1.333333334 = -0.631637687 x = -0.631637687 Simplifying x = -0.631637687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.298304355, -0.631637687}

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