3x(5-2x)+4=6

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Solution for 3x(5-2x)+4=6 equation:


Simplifying
3x(5 + -2x) + 4 = 6
(5 * 3x + -2x * 3x) + 4 = 6
(15x + -6x2) + 4 = 6

Reorder the terms:
4 + 15x + -6x2 = 6

Solving
4 + 15x + -6x2 = 6

Solving for variable 'x'.

Reorder the terms:
4 + -6 + 15x + -6x2 = 6 + -6

Combine like terms: 4 + -6 = -2
-2 + 15x + -6x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-2 + 15x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
0.3333333333 + -2.5x + x2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + -2.5x + -0.3333333333 + x2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + -2.5x + x2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + -2.5x + x2 = 0 + -0.3333333333
-2.5x + x2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
-2.5x + x2 = -0.3333333333

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = -0.3333333333 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = -0.3333333333 + 1.5625

Combine like terms: -0.3333333333 + 1.5625 = 1.2291666667
1.5625 + -2.5x + x2 = 1.2291666667

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 1.2291666667

Calculate the square root of the right side: 1.108677891

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.108677891 and -1.108677891.

Subproblem 1

x + -1.25 = 1.108677891 Simplifying x + -1.25 = 1.108677891 Reorder the terms: -1.25 + x = 1.108677891 Solving -1.25 + x = 1.108677891 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 1.108677891 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.108677891 + 1.25 x = 1.108677891 + 1.25 Combine like terms: 1.108677891 + 1.25 = 2.358677891 x = 2.358677891 Simplifying x = 2.358677891

Subproblem 2

x + -1.25 = -1.108677891 Simplifying x + -1.25 = -1.108677891 Reorder the terms: -1.25 + x = -1.108677891 Solving -1.25 + x = -1.108677891 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -1.108677891 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.108677891 + 1.25 x = -1.108677891 + 1.25 Combine like terms: -1.108677891 + 1.25 = 0.141322109 x = 0.141322109 Simplifying x = 0.141322109

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.358677891, 0.141322109}

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