(3x+2)x=300

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Solution for (3x+2)x=300 equation:


Simplifying
(3x + 2) * x = 300

Reorder the terms:
(2 + 3x) * x = 300

Reorder the terms for easier multiplication:
x(2 + 3x) = 300
(2 * x + 3x * x) = 300
(2x + 3x2) = 300

Solving
2x + 3x2 = 300

Solving for variable 'x'.

Reorder the terms:
-300 + 2x + 3x2 = 300 + -300

Combine like terms: 300 + -300 = 0
-300 + 2x + 3x2 = 0

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

Divide each side by '3'.
-100 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 0.6666666667x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 0.6666666667x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 0.6666666667x + x2 = 0 + 100
0.6666666667x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
0.6666666667x + x2 = 100

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 100 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 100 + 0.1111111112

Combine like terms: 100 + 0.1111111112 = 100.1111111112
0.1111111112 + 0.6666666667x + x2 = 100.1111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 100.1111111112

Calculate the square root of the right side: 10.005554013

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 10.005554013 and -10.005554013.

Subproblem 1

x + 0.3333333334 = 10.005554013 Simplifying x + 0.3333333334 = 10.005554013 Reorder the terms: 0.3333333334 + x = 10.005554013 Solving 0.3333333334 + x = 10.005554013 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 10.005554013 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 10.005554013 + -0.3333333334 x = 10.005554013 + -0.3333333334 Combine like terms: 10.005554013 + -0.3333333334 = 9.6722206796 x = 9.6722206796 Simplifying x = 9.6722206796

Subproblem 2

x + 0.3333333334 = -10.005554013 Simplifying x + 0.3333333334 = -10.005554013 Reorder the terms: 0.3333333334 + x = -10.005554013 Solving 0.3333333334 + x = -10.005554013 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -10.005554013 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -10.005554013 + -0.3333333334 x = -10.005554013 + -0.3333333334 Combine like terms: -10.005554013 + -0.3333333334 = -10.3388873464 x = -10.3388873464 Simplifying x = -10.3388873464

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.6722206796, -10.3388873464}

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