z-5=z^2

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Solution for z-5=z^2 equation:


Simplifying
z + -5 = z2

Reorder the terms:
-5 + z = z2

Solving
-5 + z = z2

Solving for variable 'z'.

Combine like terms: z2 + -1z2 = 0
-5 + z + -1z2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
5 + -1z + z2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -1z + -5 + z2 = 0 + -5

Reorder the terms:
5 + -5 + -1z + z2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1z + z2 = 0 + -5
-1z + z2 = 0 + -5

Combine like terms: 0 + -5 = -5
-1z + z2 = -5

The z term is z.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1z + 0.25 + z2 = -5 + 0.25

Reorder the terms:
0.25 + -1z + z2 = -5 + 0.25

Combine like terms: -5 + 0.25 = -4.75
0.25 + -1z + z2 = -4.75

Factor a perfect square on the left side:
(z + 0.5)(z + 0.5) = -4.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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