h^2+17h-9=0

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Solution for h^2+17h-9=0 equation:


Simplifying
h2 + 17h + -9 = 0

Reorder the terms:
-9 + 17h + h2 = 0

Solving
-9 + 17h + h2 = 0

Solving for variable 'h'.

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 17h + 9 + h2 = 0 + 9

Reorder the terms:
-9 + 9 + 17h + h2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 17h + h2 = 0 + 9
17h + h2 = 0 + 9

Combine like terms: 0 + 9 = 9
17h + h2 = 9

The h term is 17h.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17h + 72.25 + h2 = 9 + 72.25

Reorder the terms:
72.25 + 17h + h2 = 9 + 72.25

Combine like terms: 9 + 72.25 = 81.25
72.25 + 17h + h2 = 81.25

Factor a perfect square on the left side:
(h + 8.5)(h + 8.5) = 81.25

Calculate the square root of the right side: 9.013878189

Break this problem into two subproblems by setting 
(h + 8.5) equal to 9.013878189 and -9.013878189.

Subproblem 1

h + 8.5 = 9.013878189 Simplifying h + 8.5 = 9.013878189 Reorder the terms: 8.5 + h = 9.013878189 Solving 8.5 + h = 9.013878189 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + h = 9.013878189 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + h = 9.013878189 + -8.5 h = 9.013878189 + -8.5 Combine like terms: 9.013878189 + -8.5 = 0.513878189 h = 0.513878189 Simplifying h = 0.513878189

Subproblem 2

h + 8.5 = -9.013878189 Simplifying h + 8.5 = -9.013878189 Reorder the terms: 8.5 + h = -9.013878189 Solving 8.5 + h = -9.013878189 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + h = -9.013878189 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + h = -9.013878189 + -8.5 h = -9.013878189 + -8.5 Combine like terms: -9.013878189 + -8.5 = -17.513878189 h = -17.513878189 Simplifying h = -17.513878189

Solution

The solution to the problem is based on the solutions from the subproblems. h = {0.513878189, -17.513878189}

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