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

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


Simplifying
-3x(2x + 5) = -4(-1x + 2)

Reorder the terms:
-3x(5 + 2x) = -4(-1x + 2)
(5 * -3x + 2x * -3x) = -4(-1x + 2)
(-15x + -6x2) = -4(-1x + 2)

Reorder the terms:
-15x + -6x2 = -4(2 + -1x)
-15x + -6x2 = (2 * -4 + -1x * -4)
-15x + -6x2 = (-8 + 4x)

Solving
-15x + -6x2 = -8 + 4x

Solving for variable 'x'.

Reorder the terms:
8 + -15x + -4x + -6x2 = -8 + 4x + 8 + -4x

Combine like terms: -15x + -4x = -19x
8 + -19x + -6x2 = -8 + 4x + 8 + -4x

Reorder the terms:
8 + -19x + -6x2 = -8 + 8 + 4x + -4x

Combine like terms: -8 + 8 = 0
8 + -19x + -6x2 = 0 + 4x + -4x
8 + -19x + -6x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
8 + -19x + -6x2 = 0

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

Divide each side by '-6'.
-1.333333333 + 3.166666667x + x2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + 3.166666667x + 1.333333333 + x2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + 3.166666667x + x2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + 3.166666667x + x2 = 0 + 1.333333333
3.166666667x + x2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
3.166666667x + x2 = 1.333333333

The x term is 3.166666667x.  Take half its coefficient (1.583333334).
Square it (2.506944447) and add it to both sides.

Add '2.506944447' to each side of the equation.
3.166666667x + 2.506944447 + x2 = 1.333333333 + 2.506944447

Reorder the terms:
2.506944447 + 3.166666667x + x2 = 1.333333333 + 2.506944447

Combine like terms: 1.333333333 + 2.506944447 = 3.84027778
2.506944447 + 3.166666667x + x2 = 3.84027778

Factor a perfect square on the left side:
(x + 1.583333334)(x + 1.583333334) = 3.84027778

Calculate the square root of the right side: 1.95966267

Break this problem into two subproblems by setting 
(x + 1.583333334) equal to 1.95966267 and -1.95966267.

Subproblem 1

x + 1.583333334 = 1.95966267 Simplifying x + 1.583333334 = 1.95966267 Reorder the terms: 1.583333334 + x = 1.95966267 Solving 1.583333334 + x = 1.95966267 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.583333334' to each side of the equation. 1.583333334 + -1.583333334 + x = 1.95966267 + -1.583333334 Combine like terms: 1.583333334 + -1.583333334 = 0.000000000 0.000000000 + x = 1.95966267 + -1.583333334 x = 1.95966267 + -1.583333334 Combine like terms: 1.95966267 + -1.583333334 = 0.376329336 x = 0.376329336 Simplifying x = 0.376329336

Subproblem 2

x + 1.583333334 = -1.95966267 Simplifying x + 1.583333334 = -1.95966267 Reorder the terms: 1.583333334 + x = -1.95966267 Solving 1.583333334 + x = -1.95966267 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.583333334' to each side of the equation. 1.583333334 + -1.583333334 + x = -1.95966267 + -1.583333334 Combine like terms: 1.583333334 + -1.583333334 = 0.000000000 0.000000000 + x = -1.95966267 + -1.583333334 x = -1.95966267 + -1.583333334 Combine like terms: -1.95966267 + -1.583333334 = -3.542996004 x = -3.542996004 Simplifying x = -3.542996004

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.376329336, -3.542996004}

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