5z^2+21z+4=0

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Solution for 5z^2+21z+4=0 equation:


Simplifying
5z2 + 21z + 4 = 0

Reorder the terms:
4 + 21z + 5z2 = 0

Solving
4 + 21z + 5z2 = 0

Solving for variable 'z'.

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

Subproblem 1

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

Subproblem 2

Set the factor '(1 + 5z)' equal to zero and attempt to solve: Simplifying 1 + 5z = 0 Solving 1 + 5z = 0 Move all terms containing z to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 5z = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 5z = 0 + -1 5z = 0 + -1 Combine like terms: 0 + -1 = -1 5z = -1 Divide each side by '5'. z = -0.2 Simplifying z = -0.2

Solution

z = {-4, -0.2}

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