3h^2+9h-13=0

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Solution for 3h^2+9h-13=0 equation:


Simplifying
3h2 + 9h + -13 = 0

Reorder the terms:
-13 + 9h + 3h2 = 0

Solving
-13 + 9h + 3h2 = 0

Solving for variable 'h'.

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

Divide each side by '3'.
-4.333333333 + 3h + h2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + 3h + 4.333333333 + h2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + 3h + h2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + 3h + h2 = 0 + 4.333333333
3h + h2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
3h + h2 = 4.333333333

The h term is 3h.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3h + 2.25 + h2 = 4.333333333 + 2.25

Reorder the terms:
2.25 + 3h + h2 = 4.333333333 + 2.25

Combine like terms: 4.333333333 + 2.25 = 6.583333333
2.25 + 3h + h2 = 6.583333333

Factor a perfect square on the left side:
(h + 1.5)(h + 1.5) = 6.583333333

Calculate the square root of the right side: 2.56580072

Break this problem into two subproblems by setting 
(h + 1.5) equal to 2.56580072 and -2.56580072.

Subproblem 1

h + 1.5 = 2.56580072 Simplifying h + 1.5 = 2.56580072 Reorder the terms: 1.5 + h = 2.56580072 Solving 1.5 + h = 2.56580072 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + h = 2.56580072 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + h = 2.56580072 + -1.5 h = 2.56580072 + -1.5 Combine like terms: 2.56580072 + -1.5 = 1.06580072 h = 1.06580072 Simplifying h = 1.06580072

Subproblem 2

h + 1.5 = -2.56580072 Simplifying h + 1.5 = -2.56580072 Reorder the terms: 1.5 + h = -2.56580072 Solving 1.5 + h = -2.56580072 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + h = -2.56580072 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + h = -2.56580072 + -1.5 h = -2.56580072 + -1.5 Combine like terms: -2.56580072 + -1.5 = -4.06580072 h = -4.06580072 Simplifying h = -4.06580072

Solution

The solution to the problem is based on the solutions from the subproblems. h = {1.06580072, -4.06580072}

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