3x(x-5)=6x^2-16

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Solution for 3x(x-5)=6x^2-16 equation:


Simplifying
3x(x + -5) = 6x2 + -16

Reorder the terms:
3x(-5 + x) = 6x2 + -16
(-5 * 3x + x * 3x) = 6x2 + -16
(-15x + 3x2) = 6x2 + -16

Reorder the terms:
-15x + 3x2 = -16 + 6x2

Solving
-15x + 3x2 = -16 + 6x2

Solving for variable 'x'.

Reorder the terms:
16 + -15x + 3x2 + -6x2 = -16 + 6x2 + 16 + -6x2

Combine like terms: 3x2 + -6x2 = -3x2
16 + -15x + -3x2 = -16 + 6x2 + 16 + -6x2

Reorder the terms:
16 + -15x + -3x2 = -16 + 16 + 6x2 + -6x2

Combine like terms: -16 + 16 = 0
16 + -15x + -3x2 = 0 + 6x2 + -6x2
16 + -15x + -3x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
16 + -15x + -3x2 = 0

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

Divide each side by '-3'.
-5.333333333 + 5x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + 5x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + 5x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + 5x + x2 = 0 + 5.333333333
5x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
5x + x2 = 5.333333333

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 5.333333333 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 5.333333333 + 6.25

Combine like terms: 5.333333333 + 6.25 = 11.583333333
6.25 + 5x + x2 = 11.583333333

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 11.583333333

Calculate the square root of the right side: 3.403429643

Break this problem into two subproblems by setting 
(x + 2.5) equal to 3.403429643 and -3.403429643.

Subproblem 1

x + 2.5 = 3.403429643 Simplifying x + 2.5 = 3.403429643 Reorder the terms: 2.5 + x = 3.403429643 Solving 2.5 + x = 3.403429643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 3.403429643 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 3.403429643 + -2.5 x = 3.403429643 + -2.5 Combine like terms: 3.403429643 + -2.5 = 0.903429643 x = 0.903429643 Simplifying x = 0.903429643

Subproblem 2

x + 2.5 = -3.403429643 Simplifying x + 2.5 = -3.403429643 Reorder the terms: 2.5 + x = -3.403429643 Solving 2.5 + x = -3.403429643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -3.403429643 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -3.403429643 + -2.5 x = -3.403429643 + -2.5 Combine like terms: -3.403429643 + -2.5 = -5.903429643 x = -5.903429643 Simplifying x = -5.903429643

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.903429643, -5.903429643}

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