-z^2-8z-7=0

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Solution for -z^2-8z-7=0 equation:


Simplifying
-1z2 + -8z + -7 = 0

Reorder the terms:
-7 + -8z + -1z2 = 0

Solving
-7 + -8z + -1z2 = 0

Solving for variable 'z'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(7 + 8z + z2) = 0

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

Ignore the factor -1.

Subproblem 1

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

Subproblem 2

Set the factor '(1 + z)' equal to zero and attempt to solve: Simplifying 1 + z = 0 Solving 1 + z = 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 + z = 0 + -1 Combine like terms: 1 + -1 = 0 0 + z = 0 + -1 z = 0 + -1 Combine like terms: 0 + -1 = -1 z = -1 Simplifying z = -1

Solution

z = {-7, -1}

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