9z^2=6z+15

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


Simplifying
9z2 = 6z + 15

Reorder the terms:
9z2 = 15 + 6z

Solving
9z2 = 15 + 6z

Solving for variable 'z'.

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

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

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

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

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

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

Ignore the factor 3.

Subproblem 1

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

Subproblem 2

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

Solution

z = {-1, 1.666666667}

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