-20y^3-21y^2-4y=0

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Solution for -20y^3-21y^2-4y=0 equation:


Simplifying
-20y3 + -21y2 + -4y = 0

Reorder the terms:
-4y + -21y2 + -20y3 = 0

Solving
-4y + -21y2 + -20y3 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '-1y'.
-1y(4 + 21y + 20y2) = 0

Factor a trinomial.
-1y((4 + 5y)(1 + 4y)) = 0

Ignore the factor -1.

Subproblem 1

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

Subproblem 2

Set the factor '(4 + 5y)' equal to zero and attempt to solve: Simplifying 4 + 5y = 0 Solving 4 + 5y = 0 Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 5y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5y = 0 + -4 5y = 0 + -4 Combine like terms: 0 + -4 = -4 5y = -4 Divide each side by '5'. y = -0.8 Simplifying y = -0.8

Subproblem 3

Set the factor '(1 + 4y)' equal to zero and attempt to solve: Simplifying 1 + 4y = 0 Solving 1 + 4y = 0 Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 4y = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 4y = 0 + -1 4y = 0 + -1 Combine like terms: 0 + -1 = -1 4y = -1 Divide each side by '4'. y = -0.25 Simplifying y = -0.25

Solution

y = {0, -0.8, -0.25}

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