h^2+28h=-9

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Solution for h^2+28h=-9 equation:


Simplifying
h2 + 28h = -9

Reorder the terms:
28h + h2 = -9

Solving
28h + h2 = -9

Solving for variable 'h'.

Reorder the terms:
9 + 28h + h2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 28h + h2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + 28h + -9 + h2 = 0 + -9

Reorder the terms:
9 + -9 + 28h + h2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 28h + h2 = 0 + -9
28h + h2 = 0 + -9

Combine like terms: 0 + -9 = -9
28h + h2 = -9

The h term is 28h.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28h + 196 + h2 = -9 + 196

Reorder the terms:
196 + 28h + h2 = -9 + 196

Combine like terms: -9 + 196 = 187
196 + 28h + h2 = 187

Factor a perfect square on the left side:
(h + 14)(h + 14) = 187

Calculate the square root of the right side: 13.674794331

Break this problem into two subproblems by setting 
(h + 14) equal to 13.674794331 and -13.674794331.

Subproblem 1

h + 14 = 13.674794331 Simplifying h + 14 = 13.674794331 Reorder the terms: 14 + h = 13.674794331 Solving 14 + h = 13.674794331 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + h = 13.674794331 + -14 Combine like terms: 14 + -14 = 0 0 + h = 13.674794331 + -14 h = 13.674794331 + -14 Combine like terms: 13.674794331 + -14 = -0.325205669 h = -0.325205669 Simplifying h = -0.325205669

Subproblem 2

h + 14 = -13.674794331 Simplifying h + 14 = -13.674794331 Reorder the terms: 14 + h = -13.674794331 Solving 14 + h = -13.674794331 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + h = -13.674794331 + -14 Combine like terms: 14 + -14 = 0 0 + h = -13.674794331 + -14 h = -13.674794331 + -14 Combine like terms: -13.674794331 + -14 = -27.674794331 h = -27.674794331 Simplifying h = -27.674794331

Solution

The solution to the problem is based on the solutions from the subproblems. h = {-0.325205669, -27.674794331}

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