h^2=9h+18

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Solution for h^2=9h+18 equation:


Simplifying
h2 = 9h + 18

Reorder the terms:
h2 = 18 + 9h

Solving
h2 = 18 + 9h

Solving for variable 'h'.

Reorder the terms:
-18 + -9h + h2 = 18 + 9h + -18 + -9h

Reorder the terms:
-18 + -9h + h2 = 18 + -18 + 9h + -9h

Combine like terms: 18 + -18 = 0
-18 + -9h + h2 = 0 + 9h + -9h
-18 + -9h + h2 = 9h + -9h

Combine like terms: 9h + -9h = 0
-18 + -9h + h2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -9h + 18 + h2 = 0 + 18

Reorder the terms:
-18 + 18 + -9h + h2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -9h + h2 = 0 + 18
-9h + h2 = 0 + 18

Combine like terms: 0 + 18 = 18
-9h + h2 = 18

The h term is -9h.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9h + 20.25 + h2 = 18 + 20.25

Reorder the terms:
20.25 + -9h + h2 = 18 + 20.25

Combine like terms: 18 + 20.25 = 38.25
20.25 + -9h + h2 = 38.25

Factor a perfect square on the left side:
(h + -4.5)(h + -4.5) = 38.25

Calculate the square root of the right side: 6.184658438

Break this problem into two subproblems by setting 
(h + -4.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

h + -4.5 = 6.184658438 Simplifying h + -4.5 = 6.184658438 Reorder the terms: -4.5 + h = 6.184658438 Solving -4.5 + h = 6.184658438 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + h = 6.184658438 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + h = 6.184658438 + 4.5 h = 6.184658438 + 4.5 Combine like terms: 6.184658438 + 4.5 = 10.684658438 h = 10.684658438 Simplifying h = 10.684658438

Subproblem 2

h + -4.5 = -6.184658438 Simplifying h + -4.5 = -6.184658438 Reorder the terms: -4.5 + h = -6.184658438 Solving -4.5 + h = -6.184658438 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + h = -6.184658438 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + h = -6.184658438 + 4.5 h = -6.184658438 + 4.5 Combine like terms: -6.184658438 + 4.5 = -1.684658438 h = -1.684658438 Simplifying h = -1.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. h = {10.684658438, -1.684658438}

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