3x^2+6x=123

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Solution for 3x^2+6x=123 equation:


Simplifying
3x2 + 6x = 123

Reorder the terms:
6x + 3x2 = 123

Solving
6x + 3x2 = 123

Solving for variable 'x'.

Reorder the terms:
-123 + 6x + 3x2 = 123 + -123

Combine like terms: 123 + -123 = 0
-123 + 6x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-41 + 2x + x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-41 + 2x + x2)' equal to zero and attempt to solve: Simplifying -41 + 2x + x2 = 0 Solving -41 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '41' to each side of the equation. -41 + 2x + 41 + x2 = 0 + 41 Reorder the terms: -41 + 41 + 2x + x2 = 0 + 41 Combine like terms: -41 + 41 = 0 0 + 2x + x2 = 0 + 41 2x + x2 = 0 + 41 Combine like terms: 0 + 41 = 41 2x + x2 = 41 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = 41 + 1 Reorder the terms: 1 + 2x + x2 = 41 + 1 Combine like terms: 41 + 1 = 42 1 + 2x + x2 = 42 Factor a perfect square on the left side: (x + 1)(x + 1) = 42 Calculate the square root of the right side: 6.480740698 Break this problem into two subproblems by setting (x + 1) equal to 6.480740698 and -6.480740698.

Subproblem 1

x + 1 = 6.480740698 Simplifying x + 1 = 6.480740698 Reorder the terms: 1 + x = 6.480740698 Solving 1 + x = 6.480740698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 6.480740698 + -1 Combine like terms: 1 + -1 = 0 0 + x = 6.480740698 + -1 x = 6.480740698 + -1 Combine like terms: 6.480740698 + -1 = 5.480740698 x = 5.480740698 Simplifying x = 5.480740698

Subproblem 2

x + 1 = -6.480740698 Simplifying x + 1 = -6.480740698 Reorder the terms: 1 + x = -6.480740698 Solving 1 + x = -6.480740698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -6.480740698 + -1 Combine like terms: 1 + -1 = 0 0 + x = -6.480740698 + -1 x = -6.480740698 + -1 Combine like terms: -6.480740698 + -1 = -7.480740698 x = -7.480740698 Simplifying x = -7.480740698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.480740698, -7.480740698}

Solution

x = {5.480740698, -7.480740698}

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