x(3x+20)-(x-10)=0

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Solution for x(3x+20)-(x-10)=0 equation:


Simplifying
x(3x + 20) + -1(x + -10) = 0

Reorder the terms:
x(20 + 3x) + -1(x + -10) = 0
(20 * x + 3x * x) + -1(x + -10) = 0
(20x + 3x2) + -1(x + -10) = 0

Reorder the terms:
20x + 3x2 + -1(-10 + x) = 0
20x + 3x2 + (-10 * -1 + x * -1) = 0
20x + 3x2 + (10 + -1x) = 0

Reorder the terms:
10 + 20x + -1x + 3x2 = 0

Combine like terms: 20x + -1x = 19x
10 + 19x + 3x2 = 0

Solving
10 + 19x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
3.333333333 + 6.333333333x + x2 = 0

Move the constant term to the right:

Add '-3.333333333' to each side of the equation.
3.333333333 + 6.333333333x + -3.333333333 + x2 = 0 + -3.333333333

Reorder the terms:
3.333333333 + -3.333333333 + 6.333333333x + x2 = 0 + -3.333333333

Combine like terms: 3.333333333 + -3.333333333 = 0.000000000
0.000000000 + 6.333333333x + x2 = 0 + -3.333333333
6.333333333x + x2 = 0 + -3.333333333

Combine like terms: 0 + -3.333333333 = -3.333333333
6.333333333x + x2 = -3.333333333

The x term is 6.333333333x.  Take half its coefficient (3.166666667).
Square it (10.02777778) and add it to both sides.

Add '10.02777778' to each side of the equation.
6.333333333x + 10.02777778 + x2 = -3.333333333 + 10.02777778

Reorder the terms:
10.02777778 + 6.333333333x + x2 = -3.333333333 + 10.02777778

Combine like terms: -3.333333333 + 10.02777778 = 6.694444447
10.02777778 + 6.333333333x + x2 = 6.694444447

Factor a perfect square on the left side:
(x + 3.166666667)(x + 3.166666667) = 6.694444447

Calculate the square root of the right side: 2.58736245

Break this problem into two subproblems by setting 
(x + 3.166666667) equal to 2.58736245 and -2.58736245.

Subproblem 1

x + 3.166666667 = 2.58736245 Simplifying x + 3.166666667 = 2.58736245 Reorder the terms: 3.166666667 + x = 2.58736245 Solving 3.166666667 + x = 2.58736245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.166666667' to each side of the equation. 3.166666667 + -3.166666667 + x = 2.58736245 + -3.166666667 Combine like terms: 3.166666667 + -3.166666667 = 0.000000000 0.000000000 + x = 2.58736245 + -3.166666667 x = 2.58736245 + -3.166666667 Combine like terms: 2.58736245 + -3.166666667 = -0.579304217 x = -0.579304217 Simplifying x = -0.579304217

Subproblem 2

x + 3.166666667 = -2.58736245 Simplifying x + 3.166666667 = -2.58736245 Reorder the terms: 3.166666667 + x = -2.58736245 Solving 3.166666667 + x = -2.58736245 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.166666667' to each side of the equation. 3.166666667 + -3.166666667 + x = -2.58736245 + -3.166666667 Combine like terms: 3.166666667 + -3.166666667 = 0.000000000 0.000000000 + x = -2.58736245 + -3.166666667 x = -2.58736245 + -3.166666667 Combine like terms: -2.58736245 + -3.166666667 = -5.754029117 x = -5.754029117 Simplifying x = -5.754029117

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.579304217, -5.754029117}

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