6x^2-8x-18=0

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Solution for 6x^2-8x-18=0 equation:


Simplifying
6x2 + -8x + -18 = 0

Reorder the terms:
-18 + -8x + 6x2 = 0

Solving
-18 + -8x + 6x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-9 + -4x + 3x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-9 + -4x + 3x2)' equal to zero and attempt to solve: Simplifying -9 + -4x + 3x2 = 0 Solving -9 + -4x + 3x2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -3 + -1.333333333x + x2 = 0 Move the constant term to the right: Add '3' to each side of the equation. -3 + -1.333333333x + 3 + x2 = 0 + 3 Reorder the terms: -3 + 3 + -1.333333333x + x2 = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1.333333333x + x2 = 0 + 3 -1.333333333x + x2 = 0 + 3 Combine like terms: 0 + 3 = 3 -1.333333333x + x2 = 3 The x term is -1.333333333x. Take half its coefficient (-0.6666666665). Square it (0.4444444442) and add it to both sides. Add '0.4444444442' to each side of the equation. -1.333333333x + 0.4444444442 + x2 = 3 + 0.4444444442 Reorder the terms: 0.4444444442 + -1.333333333x + x2 = 3 + 0.4444444442 Combine like terms: 3 + 0.4444444442 = 3.4444444442 0.4444444442 + -1.333333333x + x2 = 3.4444444442 Factor a perfect square on the left side: (x + -0.6666666665)(x + -0.6666666665) = 3.4444444442 Calculate the square root of the right side: 1.855921454 Break this problem into two subproblems by setting (x + -0.6666666665) equal to 1.855921454 and -1.855921454.

Subproblem 1

x + -0.6666666665 = 1.855921454 Simplifying x + -0.6666666665 = 1.855921454 Reorder the terms: -0.6666666665 + x = 1.855921454 Solving -0.6666666665 + x = 1.855921454 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = 1.855921454 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = 1.855921454 + 0.6666666665 x = 1.855921454 + 0.6666666665 Combine like terms: 1.855921454 + 0.6666666665 = 2.5225881205 x = 2.5225881205 Simplifying x = 2.5225881205

Subproblem 2

x + -0.6666666665 = -1.855921454 Simplifying x + -0.6666666665 = -1.855921454 Reorder the terms: -0.6666666665 + x = -1.855921454 Solving -0.6666666665 + x = -1.855921454 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = -1.855921454 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = -1.855921454 + 0.6666666665 x = -1.855921454 + 0.6666666665 Combine like terms: -1.855921454 + 0.6666666665 = -1.1892547875 x = -1.1892547875 Simplifying x = -1.1892547875

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5225881205, -1.1892547875}

Solution

x = {2.5225881205, -1.1892547875}

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