0=-9z^2-6z+15

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Solution for 0=-9z^2-6z+15 equation:


Simplifying
0 = -9z2 + -6z + 15

Reorder the terms:
0 = 15 + -6z + -9z2

Solving
0 = 15 + -6z + -9z2

Solving for variable 'z'.

Combine like terms: 0 + -15 = -15
-15 + 6z + 9z2 = 15 + -6z + -9z2 + -15 + 6z + 9z2

Reorder the terms:
-15 + 6z + 9z2 = 15 + -15 + -6z + 6z + -9z2 + 9z2

Combine like terms: 15 + -15 = 0
-15 + 6z + 9z2 = 0 + -6z + 6z + -9z2 + 9z2
-15 + 6z + 9z2 = -6z + 6z + -9z2 + 9z2

Combine like terms: -6z + 6z = 0
-15 + 6z + 9z2 = 0 + -9z2 + 9z2
-15 + 6z + 9z2 = -9z2 + 9z2

Combine like terms: -9z2 + 9z2 = 0
-15 + 6z + 9z2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-5 + 2z + 3z2) = 0

Factor a trinomial.
3((-5 + -3z)(1 + -1z)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-5 + -3z)' equal to zero and attempt to solve: Simplifying -5 + -3z = 0 Solving -5 + -3z = 0 Move all terms containing z to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -3z = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -3z = 0 + 5 -3z = 0 + 5 Combine like terms: 0 + 5 = 5 -3z = 5 Divide each side by '-3'. z = -1.666666667 Simplifying z = -1.666666667

Subproblem 2

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

Solution

z = {-1.666666667, 1}

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