z^2=5z-12

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Solution for z^2=5z-12 equation:


Simplifying
z2 = 5z + -12

Reorder the terms:
z2 = -12 + 5z

Solving
z2 = -12 + 5z

Solving for variable 'z'.

Reorder the terms:
12 + -5z + z2 = -12 + 5z + 12 + -5z

Reorder the terms:
12 + -5z + z2 = -12 + 12 + 5z + -5z

Combine like terms: -12 + 12 = 0
12 + -5z + z2 = 0 + 5z + -5z
12 + -5z + z2 = 5z + -5z

Combine like terms: 5z + -5z = 0
12 + -5z + z2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -5z + -12 + z2 = 0 + -12

Reorder the terms:
12 + -12 + -5z + z2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -5z + z2 = 0 + -12
-5z + z2 = 0 + -12

Combine like terms: 0 + -12 = -12
-5z + z2 = -12

The z term is -5z.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5z + 6.25 + z2 = -12 + 6.25

Reorder the terms:
6.25 + -5z + z2 = -12 + 6.25

Combine like terms: -12 + 6.25 = -5.75
6.25 + -5z + z2 = -5.75

Factor a perfect square on the left side:
(z + -2.5)(z + -2.5) = -5.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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