0=h^2+12h-135

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Solution for 0=h^2+12h-135 equation:


Simplifying
0 = h2 + 12h + -135

Reorder the terms:
0 = -135 + 12h + h2

Solving
0 = -135 + 12h + h2

Solving for variable 'h'.

Combine like terms: 0 + 135 = 135
135 + -12h + -1h2 = -135 + 12h + h2 + 135 + -12h + -1h2

Reorder the terms:
135 + -12h + -1h2 = -135 + 135 + 12h + -12h + h2 + -1h2

Combine like terms: -135 + 135 = 0
135 + -12h + -1h2 = 0 + 12h + -12h + h2 + -1h2
135 + -12h + -1h2 = 12h + -12h + h2 + -1h2

Combine like terms: 12h + -12h = 0
135 + -12h + -1h2 = 0 + h2 + -1h2
135 + -12h + -1h2 = h2 + -1h2

Combine like terms: h2 + -1h2 = 0
135 + -12h + -1h2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-135 + 12h + h2 = 0

Move the constant term to the right:

Add '135' to each side of the equation.
-135 + 12h + 135 + h2 = 0 + 135

Reorder the terms:
-135 + 135 + 12h + h2 = 0 + 135

Combine like terms: -135 + 135 = 0
0 + 12h + h2 = 0 + 135
12h + h2 = 0 + 135

Combine like terms: 0 + 135 = 135
12h + h2 = 135

The h term is 12h.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12h + 36 + h2 = 135 + 36

Reorder the terms:
36 + 12h + h2 = 135 + 36

Combine like terms: 135 + 36 = 171
36 + 12h + h2 = 171

Factor a perfect square on the left side:
(h + 6)(h + 6) = 171

Calculate the square root of the right side: 13.076696831

Break this problem into two subproblems by setting 
(h + 6) equal to 13.076696831 and -13.076696831.

Subproblem 1

h + 6 = 13.076696831 Simplifying h + 6 = 13.076696831 Reorder the terms: 6 + h = 13.076696831 Solving 6 + h = 13.076696831 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + h = 13.076696831 + -6 Combine like terms: 6 + -6 = 0 0 + h = 13.076696831 + -6 h = 13.076696831 + -6 Combine like terms: 13.076696831 + -6 = 7.076696831 h = 7.076696831 Simplifying h = 7.076696831

Subproblem 2

h + 6 = -13.076696831 Simplifying h + 6 = -13.076696831 Reorder the terms: 6 + h = -13.076696831 Solving 6 + h = -13.076696831 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + h = -13.076696831 + -6 Combine like terms: 6 + -6 = 0 0 + h = -13.076696831 + -6 h = -13.076696831 + -6 Combine like terms: -13.076696831 + -6 = -19.076696831 h = -19.076696831 Simplifying h = -19.076696831

Solution

The solution to the problem is based on the solutions from the subproblems. h = {7.076696831, -19.076696831}

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