3x^2+18x=18

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Solution for 3x^2+18x=18 equation:


Simplifying
3x2 + 18x = 18

Reorder the terms:
18x + 3x2 = 18

Solving
18x + 3x2 = 18

Solving for variable 'x'.

Reorder the terms:
-18 + 18x + 3x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 18x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-6 + 6x + x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-6 + 6x + x2)' equal to zero and attempt to solve: Simplifying -6 + 6x + x2 = 0 Solving -6 + 6x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '6' to each side of the equation. -6 + 6x + 6 + x2 = 0 + 6 Reorder the terms: -6 + 6 + 6x + x2 = 0 + 6 Combine like terms: -6 + 6 = 0 0 + 6x + x2 = 0 + 6 6x + x2 = 0 + 6 Combine like terms: 0 + 6 = 6 6x + x2 = 6 The x term is 6x. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6x + 9 + x2 = 6 + 9 Reorder the terms: 9 + 6x + x2 = 6 + 9 Combine like terms: 6 + 9 = 15 9 + 6x + x2 = 15 Factor a perfect square on the left side: (x + 3)(x + 3) = 15 Calculate the square root of the right side: 3.872983346 Break this problem into two subproblems by setting (x + 3) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + 3 = 3.872983346 Simplifying x + 3 = 3.872983346 Reorder the terms: 3 + x = 3.872983346 Solving 3 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 3.872983346 + -3 Combine like terms: 3 + -3 = 0 0 + x = 3.872983346 + -3 x = 3.872983346 + -3 Combine like terms: 3.872983346 + -3 = 0.872983346 x = 0.872983346 Simplifying x = 0.872983346

Subproblem 2

x + 3 = -3.872983346 Simplifying x + 3 = -3.872983346 Reorder the terms: 3 + x = -3.872983346 Solving 3 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -3.872983346 + -3 Combine like terms: 3 + -3 = 0 0 + x = -3.872983346 + -3 x = -3.872983346 + -3 Combine like terms: -3.872983346 + -3 = -6.872983346 x = -6.872983346 Simplifying x = -6.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.872983346, -6.872983346}

Solution

x = {0.872983346, -6.872983346}

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