h^2+8h-18=0

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Solution for h^2+8h-18=0 equation:


Simplifying
h2 + 8h + -18 = 0

Reorder the terms:
-18 + 8h + h2 = 0

Solving
-18 + 8h + h2 = 0

Solving for variable 'h'.

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 8h + 18 + h2 = 0 + 18

Reorder the terms:
-18 + 18 + 8h + h2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 8h + h2 = 0 + 18
8h + h2 = 0 + 18

Combine like terms: 0 + 18 = 18
8h + h2 = 18

The h term is 8h.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8h + 16 + h2 = 18 + 16

Reorder the terms:
16 + 8h + h2 = 18 + 16

Combine like terms: 18 + 16 = 34
16 + 8h + h2 = 34

Factor a perfect square on the left side:
(h + 4)(h + 4) = 34

Calculate the square root of the right side: 5.830951895

Break this problem into two subproblems by setting 
(h + 4) equal to 5.830951895 and -5.830951895.

Subproblem 1

h + 4 = 5.830951895 Simplifying h + 4 = 5.830951895 Reorder the terms: 4 + h = 5.830951895 Solving 4 + h = 5.830951895 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + h = 5.830951895 + -4 Combine like terms: 4 + -4 = 0 0 + h = 5.830951895 + -4 h = 5.830951895 + -4 Combine like terms: 5.830951895 + -4 = 1.830951895 h = 1.830951895 Simplifying h = 1.830951895

Subproblem 2

h + 4 = -5.830951895 Simplifying h + 4 = -5.830951895 Reorder the terms: 4 + h = -5.830951895 Solving 4 + h = -5.830951895 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + h = -5.830951895 + -4 Combine like terms: 4 + -4 = 0 0 + h = -5.830951895 + -4 h = -5.830951895 + -4 Combine like terms: -5.830951895 + -4 = -9.830951895 h = -9.830951895 Simplifying h = -9.830951895

Solution

The solution to the problem is based on the solutions from the subproblems. h = {1.830951895, -9.830951895}

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