3x(x+3)=92

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Solution for 3x(x+3)=92 equation:


Simplifying
3x(x + 3) = 92

Reorder the terms:
3x(3 + x) = 92
(3 * 3x + x * 3x) = 92
(9x + 3x2) = 92

Solving
9x + 3x2 = 92

Solving for variable 'x'.

Reorder the terms:
-92 + 9x + 3x2 = 92 + -92

Combine like terms: 92 + -92 = 0
-92 + 9x + 3x2 = 0

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

Divide each side by '3'.
-30.66666667 + 3x + x2 = 0

Move the constant term to the right:

Add '30.66666667' to each side of the equation.
-30.66666667 + 3x + 30.66666667 + x2 = 0 + 30.66666667

Reorder the terms:
-30.66666667 + 30.66666667 + 3x + x2 = 0 + 30.66666667

Combine like terms: -30.66666667 + 30.66666667 = 0.00000000
0.00000000 + 3x + x2 = 0 + 30.66666667
3x + x2 = 0 + 30.66666667

Combine like terms: 0 + 30.66666667 = 30.66666667
3x + x2 = 30.66666667

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 30.66666667 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 30.66666667 + 2.25

Combine like terms: 30.66666667 + 2.25 = 32.91666667
2.25 + 3x + x2 = 32.91666667

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 32.91666667

Calculate the square root of the right side: 5.737304826

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.737304826 and -5.737304826.

Subproblem 1

x + 1.5 = 5.737304826 Simplifying x + 1.5 = 5.737304826 Reorder the terms: 1.5 + x = 5.737304826 Solving 1.5 + x = 5.737304826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 5.737304826 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.737304826 + -1.5 x = 5.737304826 + -1.5 Combine like terms: 5.737304826 + -1.5 = 4.237304826 x = 4.237304826 Simplifying x = 4.237304826

Subproblem 2

x + 1.5 = -5.737304826 Simplifying x + 1.5 = -5.737304826 Reorder the terms: 1.5 + x = -5.737304826 Solving 1.5 + x = -5.737304826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -5.737304826 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.737304826 + -1.5 x = -5.737304826 + -1.5 Combine like terms: -5.737304826 + -1.5 = -7.237304826 x = -7.237304826 Simplifying x = -7.237304826

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.237304826, -7.237304826}

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