7Z^2+36Z=5

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Solution for 7Z^2+36Z=5 equation:


Simplifying
7Z2 + 36Z = 5

Reorder the terms:
36Z + 7Z2 = 5

Solving
36Z + 7Z2 = 5

Solving for variable 'Z'.

Reorder the terms:
-5 + 36Z + 7Z2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 36Z + 7Z2 = 0

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

Divide each side by '7'.
-0.7142857143 + 5.142857143Z + Z2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 5.142857143Z + 0.7142857143 + Z2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 5.142857143Z + Z2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 5.142857143Z + Z2 = 0 + 0.7142857143
5.142857143Z + Z2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
5.142857143Z + Z2 = 0.7142857143

The Z term is 5.142857143Z.  Take half its coefficient (2.571428572).
Square it (6.612244901) and add it to both sides.

Add '6.612244901' to each side of the equation.
5.142857143Z + 6.612244901 + Z2 = 0.7142857143 + 6.612244901

Reorder the terms:
6.612244901 + 5.142857143Z + Z2 = 0.7142857143 + 6.612244901

Combine like terms: 0.7142857143 + 6.612244901 = 7.3265306153
6.612244901 + 5.142857143Z + Z2 = 7.3265306153

Factor a perfect square on the left side:
(Z + 2.571428572)(Z + 2.571428572) = 7.3265306153

Calculate the square root of the right side: 2.706756475

Break this problem into two subproblems by setting 
(Z + 2.571428572) equal to 2.706756475 and -2.706756475.

Subproblem 1

Z + 2.571428572 = 2.706756475 Simplifying Z + 2.571428572 = 2.706756475 Reorder the terms: 2.571428572 + Z = 2.706756475 Solving 2.571428572 + Z = 2.706756475 Solving for variable 'Z'. Move all terms containing Z to the left, all other terms to the right. Add '-2.571428572' to each side of the equation. 2.571428572 + -2.571428572 + Z = 2.706756475 + -2.571428572 Combine like terms: 2.571428572 + -2.571428572 = 0.000000000 0.000000000 + Z = 2.706756475 + -2.571428572 Z = 2.706756475 + -2.571428572 Combine like terms: 2.706756475 + -2.571428572 = 0.135327903 Z = 0.135327903 Simplifying Z = 0.135327903

Subproblem 2

Z + 2.571428572 = -2.706756475 Simplifying Z + 2.571428572 = -2.706756475 Reorder the terms: 2.571428572 + Z = -2.706756475 Solving 2.571428572 + Z = -2.706756475 Solving for variable 'Z'. Move all terms containing Z to the left, all other terms to the right. Add '-2.571428572' to each side of the equation. 2.571428572 + -2.571428572 + Z = -2.706756475 + -2.571428572 Combine like terms: 2.571428572 + -2.571428572 = 0.000000000 0.000000000 + Z = -2.706756475 + -2.571428572 Z = -2.706756475 + -2.571428572 Combine like terms: -2.706756475 + -2.571428572 = -5.278185047 Z = -5.278185047 Simplifying Z = -5.278185047

Solution

The solution to the problem is based on the solutions from the subproblems. Z = {0.135327903, -5.278185047}

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