h^2+13h-15=0

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Solution for h^2+13h-15=0 equation:


Simplifying
h2 + 13h + -15 = 0

Reorder the terms:
-15 + 13h + h2 = 0

Solving
-15 + 13h + h2 = 0

Solving for variable 'h'.

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 13h + 15 + h2 = 0 + 15

Reorder the terms:
-15 + 15 + 13h + h2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 13h + h2 = 0 + 15
13h + h2 = 0 + 15

Combine like terms: 0 + 15 = 15
13h + h2 = 15

The h term is 13h.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13h + 42.25 + h2 = 15 + 42.25

Reorder the terms:
42.25 + 13h + h2 = 15 + 42.25

Combine like terms: 15 + 42.25 = 57.25
42.25 + 13h + h2 = 57.25

Factor a perfect square on the left side:
(h + 6.5)(h + 6.5) = 57.25

Calculate the square root of the right side: 7.566372975

Break this problem into two subproblems by setting 
(h + 6.5) equal to 7.566372975 and -7.566372975.

Subproblem 1

h + 6.5 = 7.566372975 Simplifying h + 6.5 = 7.566372975 Reorder the terms: 6.5 + h = 7.566372975 Solving 6.5 + h = 7.566372975 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + h = 7.566372975 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + h = 7.566372975 + -6.5 h = 7.566372975 + -6.5 Combine like terms: 7.566372975 + -6.5 = 1.066372975 h = 1.066372975 Simplifying h = 1.066372975

Subproblem 2

h + 6.5 = -7.566372975 Simplifying h + 6.5 = -7.566372975 Reorder the terms: 6.5 + h = -7.566372975 Solving 6.5 + h = -7.566372975 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + h = -7.566372975 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + h = -7.566372975 + -6.5 h = -7.566372975 + -6.5 Combine like terms: -7.566372975 + -6.5 = -14.066372975 h = -14.066372975 Simplifying h = -14.066372975

Solution

The solution to the problem is based on the solutions from the subproblems. h = {1.066372975, -14.066372975}

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