-z^2-15z-56=0

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Solution for -z^2-15z-56=0 equation:


Simplifying
-1z2 + -15z + -56 = 0

Reorder the terms:
-56 + -15z + -1z2 = 0

Solving
-56 + -15z + -1z2 = 0

Solving for variable 'z'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(56 + 15z + z2) = 0

Factor a trinomial.
-1((8 + z)(7 + z)) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(8 + z)' equal to zero and attempt to solve: Simplifying 8 + z = 0 Solving 8 + z = 0 Move all terms containing z to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + z = 0 + -8 Combine like terms: 8 + -8 = 0 0 + z = 0 + -8 z = 0 + -8 Combine like terms: 0 + -8 = -8 z = -8 Simplifying z = -8

Subproblem 2

Set the factor '(7 + z)' equal to zero and attempt to solve: Simplifying 7 + z = 0 Solving 7 + z = 0 Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + z = 0 + -7 Combine like terms: 7 + -7 = 0 0 + z = 0 + -7 z = 0 + -7 Combine like terms: 0 + -7 = -7 z = -7 Simplifying z = -7

Solution

z = {-8, -7}

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