25z^2+40z=-16

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Solution for 25z^2+40z=-16 equation:


Simplifying
25z2 + 40z = -16

Reorder the terms:
40z + 25z2 = -16

Solving
40z + 25z2 = -16

Solving for variable 'z'.

Reorder the terms:
16 + 40z + 25z2 = -16 + 16

Combine like terms: -16 + 16 = 0
16 + 40z + 25z2 = 0

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

Subproblem 1

Set the factor '(4 + 5z)' equal to zero and attempt to solve: Simplifying 4 + 5z = 0 Solving 4 + 5z = 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 + 5z = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5z = 0 + -4 5z = 0 + -4 Combine like terms: 0 + -4 = -4 5z = -4 Divide each side by '5'. z = -0.8 Simplifying z = -0.8

Subproblem 2

Set the factor '(4 + 5z)' equal to zero and attempt to solve: Simplifying 4 + 5z = 0 Solving 4 + 5z = 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 + 5z = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 5z = 0 + -4 5z = 0 + -4 Combine like terms: 0 + -4 = -4 5z = -4 Divide each side by '5'. z = -0.8 Simplifying z = -0.8

Solution

z = {-0.8, -0.8}

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