2z^2+4z=29

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Solution for 2z^2+4z=29 equation:


Simplifying
2z2 + 4z = 29

Reorder the terms:
4z + 2z2 = 29

Solving
4z + 2z2 = 29

Solving for variable 'z'.

Reorder the terms:
-29 + 4z + 2z2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 4z + 2z2 = 0

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

Divide each side by '2'.
-14.5 + 2z + z2 = 0

Move the constant term to the right:

Add '14.5' to each side of the equation.
-14.5 + 2z + 14.5 + z2 = 0 + 14.5

Reorder the terms:
-14.5 + 14.5 + 2z + z2 = 0 + 14.5

Combine like terms: -14.5 + 14.5 = 0.0
0.0 + 2z + z2 = 0 + 14.5
2z + z2 = 0 + 14.5

Combine like terms: 0 + 14.5 = 14.5
2z + z2 = 14.5

The z term is 2z.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2z + 1 + z2 = 14.5 + 1

Reorder the terms:
1 + 2z + z2 = 14.5 + 1

Combine like terms: 14.5 + 1 = 15.5
1 + 2z + z2 = 15.5

Factor a perfect square on the left side:
(z + 1)(z + 1) = 15.5

Calculate the square root of the right side: 3.937003937

Break this problem into two subproblems by setting 
(z + 1) equal to 3.937003937 and -3.937003937.

Subproblem 1

z + 1 = 3.937003937 Simplifying z + 1 = 3.937003937 Reorder the terms: 1 + z = 3.937003937 Solving 1 + z = 3.937003937 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + z = 3.937003937 + -1 Combine like terms: 1 + -1 = 0 0 + z = 3.937003937 + -1 z = 3.937003937 + -1 Combine like terms: 3.937003937 + -1 = 2.937003937 z = 2.937003937 Simplifying z = 2.937003937

Subproblem 2

z + 1 = -3.937003937 Simplifying z + 1 = -3.937003937 Reorder the terms: 1 + z = -3.937003937 Solving 1 + z = -3.937003937 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + z = -3.937003937 + -1 Combine like terms: 1 + -1 = 0 0 + z = -3.937003937 + -1 z = -3.937003937 + -1 Combine like terms: -3.937003937 + -1 = -4.937003937 z = -4.937003937 Simplifying z = -4.937003937

Solution

The solution to the problem is based on the solutions from the subproblems. z = {2.937003937, -4.937003937}

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