8z^2+3z-3=0

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Solution for 8z^2+3z-3=0 equation:


Simplifying
8z2 + 3z + -3 = 0

Reorder the terms:
-3 + 3z + 8z2 = 0

Solving
-3 + 3z + 8z2 = 0

Solving for variable 'z'.

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

Divide each side by '8'.
-0.375 + 0.375z + z2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + 0.375z + 0.375 + z2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + 0.375z + z2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + 0.375z + z2 = 0 + 0.375
0.375z + z2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
0.375z + z2 = 0.375

The z term is 0.375z.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375z + 0.03515625 + z2 = 0.375 + 0.03515625

Reorder the terms:
0.03515625 + 0.375z + z2 = 0.375 + 0.03515625

Combine like terms: 0.375 + 0.03515625 = 0.41015625
0.03515625 + 0.375z + z2 = 0.41015625

Factor a perfect square on the left side:
(z + 0.1875)(z + 0.1875) = 0.41015625

Calculate the square root of the right side: 0.640434423

Break this problem into two subproblems by setting 
(z + 0.1875) equal to 0.640434423 and -0.640434423.

Subproblem 1

z + 0.1875 = 0.640434423 Simplifying z + 0.1875 = 0.640434423 Reorder the terms: 0.1875 + z = 0.640434423 Solving 0.1875 + z = 0.640434423 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + z = 0.640434423 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + z = 0.640434423 + -0.1875 z = 0.640434423 + -0.1875 Combine like terms: 0.640434423 + -0.1875 = 0.452934423 z = 0.452934423 Simplifying z = 0.452934423

Subproblem 2

z + 0.1875 = -0.640434423 Simplifying z + 0.1875 = -0.640434423 Reorder the terms: 0.1875 + z = -0.640434423 Solving 0.1875 + z = -0.640434423 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + z = -0.640434423 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + z = -0.640434423 + -0.1875 z = -0.640434423 + -0.1875 Combine like terms: -0.640434423 + -0.1875 = -0.827934423 z = -0.827934423 Simplifying z = -0.827934423

Solution

The solution to the problem is based on the solutions from the subproblems. z = {0.452934423, -0.827934423}

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