25z^2-150z+223=0

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Solution for 25z^2-150z+223=0 equation:


Simplifying
25z2 + -150z + 223 = 0

Reorder the terms:
223 + -150z + 25z2 = 0

Solving
223 + -150z + 25z2 = 0

Solving for variable 'z'.

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

Divide each side by '25'.
8.92 + -6z + z2 = 0

Move the constant term to the right:

Add '-8.92' to each side of the equation.
8.92 + -6z + -8.92 + z2 = 0 + -8.92

Reorder the terms:
8.92 + -8.92 + -6z + z2 = 0 + -8.92

Combine like terms: 8.92 + -8.92 = 0.00
0.00 + -6z + z2 = 0 + -8.92
-6z + z2 = 0 + -8.92

Combine like terms: 0 + -8.92 = -8.92
-6z + z2 = -8.92

The z term is -6z.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6z + 9 + z2 = -8.92 + 9

Reorder the terms:
9 + -6z + z2 = -8.92 + 9

Combine like terms: -8.92 + 9 = 0.08
9 + -6z + z2 = 0.08

Factor a perfect square on the left side:
(z + -3)(z + -3) = 0.08

Calculate the square root of the right side: 0.282842712

Break this problem into two subproblems by setting 
(z + -3) equal to 0.282842712 and -0.282842712.

Subproblem 1

z + -3 = 0.282842712 Simplifying z + -3 = 0.282842712 Reorder the terms: -3 + z = 0.282842712 Solving -3 + z = 0.282842712 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + z = 0.282842712 + 3 Combine like terms: -3 + 3 = 0 0 + z = 0.282842712 + 3 z = 0.282842712 + 3 Combine like terms: 0.282842712 + 3 = 3.282842712 z = 3.282842712 Simplifying z = 3.282842712

Subproblem 2

z + -3 = -0.282842712 Simplifying z + -3 = -0.282842712 Reorder the terms: -3 + z = -0.282842712 Solving -3 + z = -0.282842712 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + z = -0.282842712 + 3 Combine like terms: -3 + 3 = 0 0 + z = -0.282842712 + 3 z = -0.282842712 + 3 Combine like terms: -0.282842712 + 3 = 2.717157288 z = 2.717157288 Simplifying z = 2.717157288

Solution

The solution to the problem is based on the solutions from the subproblems. z = {3.282842712, 2.717157288}

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