3x^4-8x^3-x^2=0

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Solution for 3x^4-8x^3-x^2=0 equation:


Simplifying
3x4 + -8x3 + -1x2 = 0

Reorder the terms:
-1x2 + -8x3 + 3x4 = 0

Solving
-1x2 + -8x3 + 3x4 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x2'.
x2(-1 + -8x + 3x2) = 0

Subproblem 1

Set the factor 'x2' equal to zero and attempt to solve: Simplifying x2 = 0 Solving x2 = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x2 = 0 Take the square root of each side: x = {0}

Subproblem 2

Set the factor '(-1 + -8x + 3x2)' equal to zero and attempt to solve: Simplifying -1 + -8x + 3x2 = 0 Solving -1 + -8x + 3x2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -0.3333333333 + -2.666666667x + x2 = 0 Move the constant term to the right: Add '0.3333333333' to each side of the equation. -0.3333333333 + -2.666666667x + 0.3333333333 + x2 = 0 + 0.3333333333 Reorder the terms: -0.3333333333 + 0.3333333333 + -2.666666667x + x2 = 0 + 0.3333333333 Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000 0.0000000000 + -2.666666667x + x2 = 0 + 0.3333333333 -2.666666667x + x2 = 0 + 0.3333333333 Combine like terms: 0 + 0.3333333333 = 0.3333333333 -2.666666667x + x2 = 0.3333333333 The x term is -2.666666667x. Take half its coefficient (-1.333333334). Square it (1.777777780) and add it to both sides. Add '1.777777780' to each side of the equation. -2.666666667x + 1.777777780 + x2 = 0.3333333333 + 1.777777780 Reorder the terms: 1.777777780 + -2.666666667x + x2 = 0.3333333333 + 1.777777780 Combine like terms: 0.3333333333 + 1.777777780 = 2.1111111133 1.777777780 + -2.666666667x + x2 = 2.1111111133 Factor a perfect square on the left side: (x + -1.333333334)(x + -1.333333334) = 2.1111111133 Calculate the square root of the right side: 1.452966315 Break this problem into two subproblems by setting (x + -1.333333334) equal to 1.452966315 and -1.452966315.

Subproblem 1

x + -1.333333334 = 1.452966315 Simplifying x + -1.333333334 = 1.452966315 Reorder the terms: -1.333333334 + x = 1.452966315 Solving -1.333333334 + x = 1.452966315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 1.452966315 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 1.452966315 + 1.333333334 x = 1.452966315 + 1.333333334 Combine like terms: 1.452966315 + 1.333333334 = 2.786299649 x = 2.786299649 Simplifying x = 2.786299649

Subproblem 2

x + -1.333333334 = -1.452966315 Simplifying x + -1.333333334 = -1.452966315 Reorder the terms: -1.333333334 + x = -1.452966315 Solving -1.333333334 + x = -1.452966315 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -1.452966315 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -1.452966315 + 1.333333334 x = -1.452966315 + 1.333333334 Combine like terms: -1.452966315 + 1.333333334 = -0.119632981 x = -0.119632981 Simplifying x = -0.119632981

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.786299649, -0.119632981}

Solution

x = {0, 2.786299649, -0.119632981}

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