2*4*z-20-z^2=0

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Solution for 2*4*z-20-z^2=0 equation:


Simplifying
2 * 4z + -20 + -1z2 = 0

Multiply 2 * 4
8z + -20 + -1z2 = 0

Reorder the terms:
-20 + 8z + -1z2 = 0

Solving
-20 + 8z + -1z2 = 0

Solving for variable 'z'.

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

Divide each side by '-1'.
20 + -8z + z2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -8z + -20 + z2 = 0 + -20

Reorder the terms:
20 + -20 + -8z + z2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -8z + z2 = 0 + -20
-8z + z2 = 0 + -20

Combine like terms: 0 + -20 = -20
-8z + z2 = -20

The z term is -8z.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8z + 16 + z2 = -20 + 16

Reorder the terms:
16 + -8z + z2 = -20 + 16

Combine like terms: -20 + 16 = -4
16 + -8z + z2 = -4

Factor a perfect square on the left side:
(z + -4)(z + -4) = -4

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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