h^2+2h=27

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Solution for h^2+2h=27 equation:


Simplifying
h2 + 2h = 27

Reorder the terms:
2h + h2 = 27

Solving
2h + h2 = 27

Solving for variable 'h'.

Reorder the terms:
-27 + 2h + h2 = 27 + -27

Combine like terms: 27 + -27 = 0
-27 + 2h + h2 = 0

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + 2h + 27 + h2 = 0 + 27

Reorder the terms:
-27 + 27 + 2h + h2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 2h + h2 = 0 + 27
2h + h2 = 0 + 27

Combine like terms: 0 + 27 = 27
2h + h2 = 27

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

Add '1' to each side of the equation.
2h + 1 + h2 = 27 + 1

Reorder the terms:
1 + 2h + h2 = 27 + 1

Combine like terms: 27 + 1 = 28
1 + 2h + h2 = 28

Factor a perfect square on the left side:
(h + 1)(h + 1) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(h + 1) equal to 5.291502622 and -5.291502622.

Subproblem 1

h + 1 = 5.291502622 Simplifying h + 1 = 5.291502622 Reorder the terms: 1 + h = 5.291502622 Solving 1 + h = 5.291502622 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + h = 5.291502622 + -1 Combine like terms: 1 + -1 = 0 0 + h = 5.291502622 + -1 h = 5.291502622 + -1 Combine like terms: 5.291502622 + -1 = 4.291502622 h = 4.291502622 Simplifying h = 4.291502622

Subproblem 2

h + 1 = -5.291502622 Simplifying h + 1 = -5.291502622 Reorder the terms: 1 + h = -5.291502622 Solving 1 + h = -5.291502622 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + h = -5.291502622 + -1 Combine like terms: 1 + -1 = 0 0 + h = -5.291502622 + -1 h = -5.291502622 + -1 Combine like terms: -5.291502622 + -1 = -6.291502622 h = -6.291502622 Simplifying h = -6.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. h = {4.291502622, -6.291502622}

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