-3x(x-5)=x+7-4

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Solution for -3x(x-5)=x+7-4 equation:


Simplifying
-3x(x + -5) = x + 7 + -4

Reorder the terms:
-3x(-5 + x) = x + 7 + -4
(-5 * -3x + x * -3x) = x + 7 + -4
(15x + -3x2) = x + 7 + -4

Reorder the terms:
15x + -3x2 = 7 + -4 + x

Combine like terms: 7 + -4 = 3
15x + -3x2 = 3 + x

Solving
15x + -3x2 = 3 + x

Solving for variable 'x'.

Reorder the terms:
-3 + 15x + -1x + -3x2 = 3 + x + -3 + -1x

Combine like terms: 15x + -1x = 14x
-3 + 14x + -3x2 = 3 + x + -3 + -1x

Reorder the terms:
-3 + 14x + -3x2 = 3 + -3 + x + -1x

Combine like terms: 3 + -3 = 0
-3 + 14x + -3x2 = 0 + x + -1x
-3 + 14x + -3x2 = x + -1x

Combine like terms: x + -1x = 0
-3 + 14x + -3x2 = 0

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

Divide each side by '-3'.
1 + -4.666666667x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -4.666666667x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -4.666666667x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -4.666666667x + x2 = 0 + -1
-4.666666667x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
-4.666666667x + x2 = -1

The x term is -4.666666667x.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667x + 5.444444448 + x2 = -1 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667x + x2 = -1 + 5.444444448

Combine like terms: -1 + 5.444444448 = 4.444444448
5.444444448 + -4.666666667x + x2 = 4.444444448

Factor a perfect square on the left side:
(x + -2.333333334)(x + -2.333333334) = 4.444444448

Calculate the square root of the right side: 2.108185108

Break this problem into two subproblems by setting 
(x + -2.333333334) equal to 2.108185108 and -2.108185108.

Subproblem 1

x + -2.333333334 = 2.108185108 Simplifying x + -2.333333334 = 2.108185108 Reorder the terms: -2.333333334 + x = 2.108185108 Solving -2.333333334 + x = 2.108185108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + x = 2.108185108 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + x = 2.108185108 + 2.333333334 x = 2.108185108 + 2.333333334 Combine like terms: 2.108185108 + 2.333333334 = 4.441518442 x = 4.441518442 Simplifying x = 4.441518442

Subproblem 2

x + -2.333333334 = -2.108185108 Simplifying x + -2.333333334 = -2.108185108 Reorder the terms: -2.333333334 + x = -2.108185108 Solving -2.333333334 + x = -2.108185108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + x = -2.108185108 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + x = -2.108185108 + 2.333333334 x = -2.108185108 + 2.333333334 Combine like terms: -2.108185108 + 2.333333334 = 0.225148226 x = 0.225148226 Simplifying x = 0.225148226

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.441518442, 0.225148226}

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