2z-z^2-7=0

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Solution for 2z-z^2-7=0 equation:


Simplifying
2z + -1z2 + -7 = 0

Reorder the terms:
-7 + 2z + -1z2 = 0

Solving
-7 + 2z + -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'.
7 + -2z + z2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -2z + -7 + z2 = 0 + -7

Reorder the terms:
7 + -7 + -2z + z2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -2z + z2 = 0 + -7
-2z + z2 = 0 + -7

Combine like terms: 0 + -7 = -7
-2z + z2 = -7

The z term is -2z.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2z + 1 + z2 = -7 + 1

Reorder the terms:
1 + -2z + z2 = -7 + 1

Combine like terms: -7 + 1 = -6
1 + -2z + z2 = -6

Factor a perfect square on the left side:
(z + -1)(z + -1) = -6

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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