5z^2+2z+5=0

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Solution for 5z^2+2z+5=0 equation:


Simplifying
5z2 + 2z + 5 = 0

Reorder the terms:
5 + 2z + 5z2 = 0

Solving
5 + 2z + 5z2 = 0

Solving for variable 'z'.

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

Divide each side by '5'.
1 + 0.4z + z2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 0.4z + -1 + z2 = 0 + -1

Reorder the terms:
1 + -1 + 0.4z + z2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 0.4z + z2 = 0 + -1
0.4z + z2 = 0 + -1

Combine like terms: 0 + -1 = -1
0.4z + z2 = -1

The z term is 0.4z.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4z + 0.04 + z2 = -1 + 0.04

Reorder the terms:
0.04 + 0.4z + z2 = -1 + 0.04

Combine like terms: -1 + 0.04 = -0.96
0.04 + 0.4z + z2 = -0.96

Factor a perfect square on the left side:
(z + 0.2)(z + 0.2) = -0.96

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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