-21y-4=5y^2

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Solution for -21y-4=5y^2 equation:


Simplifying
-21y + -4 = 5y2

Reorder the terms:
-4 + -21y = 5y2

Solving
-4 + -21y = 5y2

Solving for variable 'y'.

Combine like terms: 5y2 + -5y2 = 0
-4 + -21y + -5y2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(4 + 21y + 5y2) = 0

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

Ignore the factor -1.

Subproblem 1

Set the factor '(4 + y)' equal to zero and attempt to solve: Simplifying 4 + y = 0 Solving 4 + y = 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 + y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + y = 0 + -4 y = 0 + -4 Combine like terms: 0 + -4 = -4 y = -4 Simplifying y = -4

Subproblem 2

Set the factor '(1 + 5y)' equal to zero and attempt to solve: Simplifying 1 + 5y = 0 Solving 1 + 5y = 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 + 5y = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 5y = 0 + -1 5y = 0 + -1 Combine like terms: 0 + -1 = -1 5y = -1 Divide each side by '5'. y = -0.2 Simplifying y = -0.2

Solution

y = {-4, -0.2}

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