3x(x+2)=5-(x-9)

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Solution for 3x(x+2)=5-(x-9) equation:


Simplifying
3x(x + 2) = 5 + -1(x + -9)

Reorder the terms:
3x(2 + x) = 5 + -1(x + -9)
(2 * 3x + x * 3x) = 5 + -1(x + -9)
(6x + 3x2) = 5 + -1(x + -9)

Reorder the terms:
6x + 3x2 = 5 + -1(-9 + x)
6x + 3x2 = 5 + (-9 * -1 + x * -1)
6x + 3x2 = 5 + (9 + -1x)

Combine like terms: 5 + 9 = 14
6x + 3x2 = 14 + -1x

Solving
6x + 3x2 = 14 + -1x

Solving for variable 'x'.

Reorder the terms:
-14 + 6x + x + 3x2 = 14 + -1x + -14 + x

Combine like terms: 6x + x = 7x
-14 + 7x + 3x2 = 14 + -1x + -14 + x

Reorder the terms:
-14 + 7x + 3x2 = 14 + -14 + -1x + x

Combine like terms: 14 + -14 = 0
-14 + 7x + 3x2 = 0 + -1x + x
-14 + 7x + 3x2 = -1x + x

Combine like terms: -1x + x = 0
-14 + 7x + 3x2 = 0

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

Divide each side by '3'.
-4.666666667 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + 2.333333333x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + 2.333333333x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + 2.333333333x + x2 = 0 + 4.666666667
2.333333333x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
2.333333333x + x2 = 4.666666667

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 4.666666667 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 4.666666667 + 1.361111112

Combine like terms: 4.666666667 + 1.361111112 = 6.027777779
1.361111112 + 2.333333333x + x2 = 6.027777779

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 6.027777779

Calculate the square root of the right side: 2.455153311

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 2.455153311 and -2.455153311.

Subproblem 1

x + 1.166666667 = 2.455153311 Simplifying x + 1.166666667 = 2.455153311 Reorder the terms: 1.166666667 + x = 2.455153311 Solving 1.166666667 + x = 2.455153311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 2.455153311 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 2.455153311 + -1.166666667 x = 2.455153311 + -1.166666667 Combine like terms: 2.455153311 + -1.166666667 = 1.288486644 x = 1.288486644 Simplifying x = 1.288486644

Subproblem 2

x + 1.166666667 = -2.455153311 Simplifying x + 1.166666667 = -2.455153311 Reorder the terms: 1.166666667 + x = -2.455153311 Solving 1.166666667 + x = -2.455153311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -2.455153311 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -2.455153311 + -1.166666667 x = -2.455153311 + -1.166666667 Combine like terms: -2.455153311 + -1.166666667 = -3.621819978 x = -3.621819978 Simplifying x = -3.621819978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.288486644, -3.621819978}

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