7+5z^2=-8z

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Solution for 7+5z^2=-8z equation:


Simplifying
7 + 5z2 = -8z

Solving
7 + 5z2 = -8z

Solving for variable 'z'.

Reorder the terms:
7 + 8z + 5z2 = -8z + 8z

Combine like terms: -8z + 8z = 0
7 + 8z + 5z2 = 0

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

Divide each side by '5'.
1.4 + 1.6z + z2 = 0

Move the constant term to the right:

Add '-1.4' to each side of the equation.
1.4 + 1.6z + -1.4 + z2 = 0 + -1.4

Reorder the terms:
1.4 + -1.4 + 1.6z + z2 = 0 + -1.4

Combine like terms: 1.4 + -1.4 = 0.0
0.0 + 1.6z + z2 = 0 + -1.4
1.6z + z2 = 0 + -1.4

Combine like terms: 0 + -1.4 = -1.4
1.6z + z2 = -1.4

The z term is 1.6z.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6z + 0.64 + z2 = -1.4 + 0.64

Reorder the terms:
0.64 + 1.6z + z2 = -1.4 + 0.64

Combine like terms: -1.4 + 0.64 = -0.76
0.64 + 1.6z + z2 = -0.76

Factor a perfect square on the left side:
(z + 0.8)(z + 0.8) = -0.76

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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