10z^2-8z+1.6=0

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Solution for 10z^2-8z+1.6=0 equation:


Simplifying
10z2 + -8z + 1.6 = 0

Reorder the terms:
1.6 + -8z + 10z2 = 0

Solving
1.6 + -8z + 10z2 = 0

Solving for variable 'z'.

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

Divide each side by '10'.
0.16 + -0.8z + z2 = 0

Move the constant term to the right:

Add '-0.16' to each side of the equation.
0.16 + -0.8z + -0.16 + z2 = 0 + -0.16

Reorder the terms:
0.16 + -0.16 + -0.8z + z2 = 0 + -0.16

Combine like terms: 0.16 + -0.16 = 0.00
0.00 + -0.8z + z2 = 0 + -0.16
-0.8z + z2 = 0 + -0.16

Combine like terms: 0 + -0.16 = -0.16
-0.8z + z2 = -0.16

The z term is -0.8z.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8z + 0.16 + z2 = -0.16 + 0.16

Reorder the terms:
0.16 + -0.8z + z2 = -0.16 + 0.16

Combine like terms: -0.16 + 0.16 = 0.00
0.16 + -0.8z + z2 = 0.00

Factor a perfect square on the left side:
(z + -0.4)(z + -0.4) = 0.00

Calculate the square root of the right side: 0.00

Break this problem into two subproblems by setting 
(z + -0.4) equal to 0.00 and 0.00.

Subproblem 1

z + -0.4 = 0.00 Simplifying z + -0.4 = 0.00 Reorder the terms: -0.4 + z = 0.00 Solving -0.4 + z = 0.00 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + z = 0.00 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + z = 0.00 + 0.4 z = 0.00 + 0.4 Combine like terms: 0.00 + 0.4 = 0.4 z = 0.4 Simplifying z = 0.4

Subproblem 2

z + -0.4 = 0.00 Simplifying z + -0.4 = 0.00 Reorder the terms: -0.4 + z = 0.00 Solving -0.4 + z = 0.00 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + z = 0.00 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + z = 0.00 + 0.4 z = 0.00 + 0.4 Combine like terms: 0.00 + 0.4 = 0.4 z = 0.4 Simplifying z = 0.4

Solution

The solution to the problem is based on the solutions from the subproblems. z = {0.4, 0.4}

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