25z^2+98=100z

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Solution for 25z^2+98=100z equation:


Simplifying
25z2 + 98 = 100z

Reorder the terms:
98 + 25z2 = 100z

Solving
98 + 25z2 = 100z

Solving for variable 'z'.

Reorder the terms:
98 + -100z + 25z2 = 100z + -100z

Combine like terms: 100z + -100z = 0
98 + -100z + 25z2 = 0

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

Divide each side by '25'.
3.92 + -4z + z2 = 0

Move the constant term to the right:

Add '-3.92' to each side of the equation.
3.92 + -4z + -3.92 + z2 = 0 + -3.92

Reorder the terms:
3.92 + -3.92 + -4z + z2 = 0 + -3.92

Combine like terms: 3.92 + -3.92 = 0.00
0.00 + -4z + z2 = 0 + -3.92
-4z + z2 = 0 + -3.92

Combine like terms: 0 + -3.92 = -3.92
-4z + z2 = -3.92

The z term is -4z.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4z + 4 + z2 = -3.92 + 4

Reorder the terms:
4 + -4z + z2 = -3.92 + 4

Combine like terms: -3.92 + 4 = 0.08
4 + -4z + z2 = 0.08

Factor a perfect square on the left side:
(z + -2)(z + -2) = 0.08

Calculate the square root of the right side: 0.282842712

Break this problem into two subproblems by setting 
(z + -2) equal to 0.282842712 and -0.282842712.

Subproblem 1

z + -2 = 0.282842712 Simplifying z + -2 = 0.282842712 Reorder the terms: -2 + z = 0.282842712 Solving -2 + z = 0.282842712 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + z = 0.282842712 + 2 Combine like terms: -2 + 2 = 0 0 + z = 0.282842712 + 2 z = 0.282842712 + 2 Combine like terms: 0.282842712 + 2 = 2.282842712 z = 2.282842712 Simplifying z = 2.282842712

Subproblem 2

z + -2 = -0.282842712 Simplifying z + -2 = -0.282842712 Reorder the terms: -2 + z = -0.282842712 Solving -2 + z = -0.282842712 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + z = -0.282842712 + 2 Combine like terms: -2 + 2 = 0 0 + z = -0.282842712 + 2 z = -0.282842712 + 2 Combine like terms: -0.282842712 + 2 = 1.717157288 z = 1.717157288 Simplifying z = 1.717157288

Solution

The solution to the problem is based on the solutions from the subproblems. z = {2.282842712, 1.717157288}

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