9x^3+21x^2+3x=0

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Solution for 9x^3+21x^2+3x=0 equation:


Simplifying
9x3 + 21x2 + 3x = 0

Reorder the terms:
3x + 21x2 + 9x3 = 0

Solving
3x + 21x2 + 9x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3x'.
3x(1 + 7x + 3x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(1 + 7x + 3x2)' equal to zero and attempt to solve: Simplifying 1 + 7x + 3x2 = 0 Solving 1 + 7x + 3x2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. 0.3333333333 + 2.333333333x + x2 = 0 Move the constant term to the right: Add '-0.3333333333' to each side of the equation. 0.3333333333 + 2.333333333x + -0.3333333333 + x2 = 0 + -0.3333333333 Reorder the terms: 0.3333333333 + -0.3333333333 + 2.333333333x + x2 = 0 + -0.3333333333 Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000 0.0000000000 + 2.333333333x + x2 = 0 + -0.3333333333 2.333333333x + x2 = 0 + -0.3333333333 Combine like terms: 0 + -0.3333333333 = -0.3333333333 2.333333333x + x2 = -0.3333333333 The x term is 2.333333333x. Take half its coefficient (1.166666667). Square it (1.361111112) and add it to both sides. Add '1.361111112' to each side of the equation. 2.333333333x + 1.361111112 + x2 = -0.3333333333 + 1.361111112 Reorder the terms: 1.361111112 + 2.333333333x + x2 = -0.3333333333 + 1.361111112 Combine like terms: -0.3333333333 + 1.361111112 = 1.0277777787 1.361111112 + 2.333333333x + x2 = 1.0277777787 Factor a perfect square on the left side: (x + 1.166666667)(x + 1.166666667) = 1.0277777787 Calculate the square root of the right side: 1.013793756 Break this problem into two subproblems by setting (x + 1.166666667) equal to 1.013793756 and -1.013793756.

Subproblem 1

x + 1.166666667 = 1.013793756 Simplifying x + 1.166666667 = 1.013793756 Reorder the terms: 1.166666667 + x = 1.013793756 Solving 1.166666667 + x = 1.013793756 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 1.013793756 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 1.013793756 + -1.166666667 x = 1.013793756 + -1.166666667 Combine like terms: 1.013793756 + -1.166666667 = -0.152872911 x = -0.152872911 Simplifying x = -0.152872911

Subproblem 2

x + 1.166666667 = -1.013793756 Simplifying x + 1.166666667 = -1.013793756 Reorder the terms: 1.166666667 + x = -1.013793756 Solving 1.166666667 + x = -1.013793756 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -1.013793756 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -1.013793756 + -1.166666667 x = -1.013793756 + -1.166666667 Combine like terms: -1.013793756 + -1.166666667 = -2.180460423 x = -2.180460423 Simplifying x = -2.180460423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.152872911, -2.180460423}

Solution

x = {0, -0.152872911, -2.180460423}

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