3(10+x)-(30+3x)x=-4

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Solution for 3(10+x)-(30+3x)x=-4 equation:


Simplifying
3(10 + x) + -1(30 + 3x) * x = -4
(10 * 3 + x * 3) + -1(30 + 3x) * x = -4
(30 + 3x) + -1(30 + 3x) * x = -4

Reorder the terms for easier multiplication:
30 + 3x + -1x(30 + 3x) = -4
30 + 3x + (30 * -1x + 3x * -1x) = -4
30 + 3x + (-30x + -3x2) = -4

Combine like terms: 3x + -30x = -27x
30 + -27x + -3x2 = -4

Solving
30 + -27x + -3x2 = -4

Solving for variable 'x'.

Reorder the terms:
30 + 4 + -27x + -3x2 = -4 + 4

Combine like terms: 30 + 4 = 34
34 + -27x + -3x2 = -4 + 4

Combine like terms: -4 + 4 = 0
34 + -27x + -3x2 = 0

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

Divide each side by '-3'.
-11.33333333 + 9x + x2 = 0

Move the constant term to the right:

Add '11.33333333' to each side of the equation.
-11.33333333 + 9x + 11.33333333 + x2 = 0 + 11.33333333

Reorder the terms:
-11.33333333 + 11.33333333 + 9x + x2 = 0 + 11.33333333

Combine like terms: -11.33333333 + 11.33333333 = 0.00000000
0.00000000 + 9x + x2 = 0 + 11.33333333
9x + x2 = 0 + 11.33333333

Combine like terms: 0 + 11.33333333 = 11.33333333
9x + x2 = 11.33333333

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 11.33333333 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 11.33333333 + 20.25

Combine like terms: 11.33333333 + 20.25 = 31.58333333
20.25 + 9x + x2 = 31.58333333

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 31.58333333

Calculate the square root of the right side: 5.6199051

Break this problem into two subproblems by setting 
(x + 4.5) equal to 5.6199051 and -5.6199051.

Subproblem 1

x + 4.5 = 5.6199051 Simplifying x + 4.5 = 5.6199051 Reorder the terms: 4.5 + x = 5.6199051 Solving 4.5 + x = 5.6199051 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 5.6199051 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 5.6199051 + -4.5 x = 5.6199051 + -4.5 Combine like terms: 5.6199051 + -4.5 = 1.1199051 x = 1.1199051 Simplifying x = 1.1199051

Subproblem 2

x + 4.5 = -5.6199051 Simplifying x + 4.5 = -5.6199051 Reorder the terms: 4.5 + x = -5.6199051 Solving 4.5 + x = -5.6199051 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -5.6199051 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -5.6199051 + -4.5 x = -5.6199051 + -4.5 Combine like terms: -5.6199051 + -4.5 = -10.1199051 x = -10.1199051 Simplifying x = -10.1199051

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1199051, -10.1199051}

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