4y^2=-21y-5

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


Simplifying
4y2 = -21y + -5

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

Solving
4y2 = -5 + -21y

Solving for variable 'y'.

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

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

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

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

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

Subproblem 1

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

Subproblem 2

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 = {-5, -0.25}

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