-(-2z^2+z-9)=

Solution for -(-2z^2+z-9)= equation:

Simplifying
-1(-2z2 + z + -9) = 0

Reorder the terms:
-1(-9 + z + -2z2) = 0
(-9 * -1 + z * -1 + -2z2 * -1) = 0
(9 + -1z + 2z2) = 0

Solving
9 + -1z + 2z2 = 0

Solving for variable 'z'.

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

Divide each side by '2'.
4.5 + -0.5z + z2 = 0

Move the constant term to the right:

Add '-4.5' to each side of the equation.
4.5 + -0.5z + -4.5 + z2 = 0 + -4.5

Reorder the terms:
4.5 + -4.5 + -0.5z + z2 = 0 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + -0.5z + z2 = 0 + -4.5
-0.5z + z2 = 0 + -4.5

Combine like terms: 0 + -4.5 = -4.5
-0.5z + z2 = -4.5

The z term is -0.5z.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5z + 0.0625 + z2 = -4.5 + 0.0625

Reorder the terms:
0.0625 + -0.5z + z2 = -4.5 + 0.0625

Combine like terms: -4.5 + 0.0625 = -4.4375
0.0625 + -0.5z + z2 = -4.4375

Factor a perfect square on the left side:
(z + -0.25)(z + -0.25) = -4.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.