z^2=3z-18

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Solution for z^2=3z-18 equation:


Simplifying
z2 = 3z + -18

Reorder the terms:
z2 = -18 + 3z

Solving
z2 = -18 + 3z

Solving for variable 'z'.

Reorder the terms:
18 + -3z + z2 = -18 + 3z + 18 + -3z

Reorder the terms:
18 + -3z + z2 = -18 + 18 + 3z + -3z

Combine like terms: -18 + 18 = 0
18 + -3z + z2 = 0 + 3z + -3z
18 + -3z + z2 = 3z + -3z

Combine like terms: 3z + -3z = 0
18 + -3z + z2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -3z + -18 + z2 = 0 + -18

Reorder the terms:
18 + -18 + -3z + z2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -3z + z2 = 0 + -18
-3z + z2 = 0 + -18

Combine like terms: 0 + -18 = -18
-3z + z2 = -18

The z term is -3z.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3z + 2.25 + z2 = -18 + 2.25

Reorder the terms:
2.25 + -3z + z2 = -18 + 2.25

Combine like terms: -18 + 2.25 = -15.75
2.25 + -3z + z2 = -15.75

Factor a perfect square on the left side:
(z + -1.5)(z + -1.5) = -15.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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