(6z^2-8z-4)-(-7z^2-7z-9)=

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Solution for (6z^2-8z-4)-(-7z^2-7z-9)= equation:


Simplifying
(6z2 + -8z + -4) + -1(-7z2 + -7z + -9) = 0

Reorder the terms:
(-4 + -8z + 6z2) + -1(-7z2 + -7z + -9) = 0

Remove parenthesis around (-4 + -8z + 6z2)
-4 + -8z + 6z2 + -1(-7z2 + -7z + -9) = 0

Reorder the terms:
-4 + -8z + 6z2 + -1(-9 + -7z + -7z2) = 0
-4 + -8z + 6z2 + (-9 * -1 + -7z * -1 + -7z2 * -1) = 0
-4 + -8z + 6z2 + (9 + 7z + 7z2) = 0

Reorder the terms:
-4 + 9 + -8z + 7z + 6z2 + 7z2 = 0

Combine like terms: -4 + 9 = 5
5 + -8z + 7z + 6z2 + 7z2 = 0

Combine like terms: -8z + 7z = -1z
5 + -1z + 6z2 + 7z2 = 0

Combine like terms: 6z2 + 7z2 = 13z2
5 + -1z + 13z2 = 0

Solving
5 + -1z + 13z2 = 0

Solving for variable 'z'.

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

Divide each side by '13'.
0.3846153846 + -0.07692307692z + z2 = 0

Move the constant term to the right:

Add '-0.3846153846' to each side of the equation.
0.3846153846 + -0.07692307692z + -0.3846153846 + z2 = 0 + -0.3846153846

Reorder the terms:
0.3846153846 + -0.3846153846 + -0.07692307692z + z2 = 0 + -0.3846153846

Combine like terms: 0.3846153846 + -0.3846153846 = 0.0000000000
0.0000000000 + -0.07692307692z + z2 = 0 + -0.3846153846
-0.07692307692z + z2 = 0 + -0.3846153846

Combine like terms: 0 + -0.3846153846 = -0.3846153846
-0.07692307692z + z2 = -0.3846153846

The z term is -0.07692307692z.  Take half its coefficient (-0.03846153846).
Square it (0.001479289941) and add it to both sides.

Add '0.001479289941' to each side of the equation.
-0.07692307692z + 0.001479289941 + z2 = -0.3846153846 + 0.001479289941

Reorder the terms:
0.001479289941 + -0.07692307692z + z2 = -0.3846153846 + 0.001479289941

Combine like terms: -0.3846153846 + 0.001479289941 = -0.383136094659
0.001479289941 + -0.07692307692z + z2 = -0.383136094659

Factor a perfect square on the left side:
(z + -0.03846153846)(z + -0.03846153846) = -0.383136094659

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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