7z*5z-2z+z=33

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Solution for 7z*5z-2z+z=33 equation:


Simplifying
7z * 5z + -2z + z = 33

Reorder the terms for easier multiplication:
7 * 5z * z + -2z + z = 33

Multiply 7 * 5
35z * z + -2z + z = 33

Multiply z * z
35z2 + -2z + z = 33

Reorder the terms:
-2z + z + 35z2 = 33

Combine like terms: -2z + z = -1z
-1z + 35z2 = 33

Solving
-1z + 35z2 = 33

Solving for variable 'z'.

Reorder the terms:
-33 + -1z + 35z2 = 33 + -33

Combine like terms: 33 + -33 = 0
-33 + -1z + 35z2 = 0

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

Divide each side by '35'.
-0.9428571429 + -0.02857142857z + z2 = 0

Move the constant term to the right:

Add '0.9428571429' to each side of the equation.
-0.9428571429 + -0.02857142857z + 0.9428571429 + z2 = 0 + 0.9428571429

Reorder the terms:
-0.9428571429 + 0.9428571429 + -0.02857142857z + z2 = 0 + 0.9428571429

Combine like terms: -0.9428571429 + 0.9428571429 = 0.0000000000
0.0000000000 + -0.02857142857z + z2 = 0 + 0.9428571429
-0.02857142857z + z2 = 0 + 0.9428571429

Combine like terms: 0 + 0.9428571429 = 0.9428571429
-0.02857142857z + z2 = 0.9428571429

The z term is -0.02857142857z.  Take half its coefficient (-0.01428571429).
Square it (0.0002040816328) and add it to both sides.

Add '0.0002040816328' to each side of the equation.
-0.02857142857z + 0.0002040816328 + z2 = 0.9428571429 + 0.0002040816328

Reorder the terms:
0.0002040816328 + -0.02857142857z + z2 = 0.9428571429 + 0.0002040816328

Combine like terms: 0.9428571429 + 0.0002040816328 = 0.9430612245328
0.0002040816328 + -0.02857142857z + z2 = 0.9430612245328

Factor a perfect square on the left side:
(z + -0.01428571429)(z + -0.01428571429) = 0.9430612245328

Calculate the square root of the right side: 0.971113394

Break this problem into two subproblems by setting 
(z + -0.01428571429) equal to 0.971113394 and -0.971113394.

Subproblem 1

z + -0.01428571429 = 0.971113394 Simplifying z + -0.01428571429 = 0.971113394 Reorder the terms: -0.01428571429 + z = 0.971113394 Solving -0.01428571429 + z = 0.971113394 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.01428571429' to each side of the equation. -0.01428571429 + 0.01428571429 + z = 0.971113394 + 0.01428571429 Combine like terms: -0.01428571429 + 0.01428571429 = 0.00000000000 0.00000000000 + z = 0.971113394 + 0.01428571429 z = 0.971113394 + 0.01428571429 Combine like terms: 0.971113394 + 0.01428571429 = 0.98539910829 z = 0.98539910829 Simplifying z = 0.98539910829

Subproblem 2

z + -0.01428571429 = -0.971113394 Simplifying z + -0.01428571429 = -0.971113394 Reorder the terms: -0.01428571429 + z = -0.971113394 Solving -0.01428571429 + z = -0.971113394 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.01428571429' to each side of the equation. -0.01428571429 + 0.01428571429 + z = -0.971113394 + 0.01428571429 Combine like terms: -0.01428571429 + 0.01428571429 = 0.00000000000 0.00000000000 + z = -0.971113394 + 0.01428571429 z = -0.971113394 + 0.01428571429 Combine like terms: -0.971113394 + 0.01428571429 = -0.95682767971 z = -0.95682767971 Simplifying z = -0.95682767971

Solution

The solution to the problem is based on the solutions from the subproblems. z = {0.98539910829, -0.95682767971}

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